The λmax of 2,3,4-trimethylhexatriene is 280 nm.
Ethylene has a λmax of 175nm.
Butadiene has a λmax of 220nm.
2-methyl-1,3-butadiene has a λmax or 215nm.
1,3,5-hexatriene has a λmax of 258nm.
Woodward's rules, sometimes known as Woodward-Fieser rules (after Louis Fieser) and named after Robert Burns Woodward, are a number of sets of empirically developed principles that aim to forecast the wavelength of the absorption maximum (max) in an ultraviolet-visible spectrum of a certain molecule.
By using the Woodward Fieser rule,
R- (Alkyl Group) .... +5 nm = 5 × 2 = 10
RO- (Alkoxy Group) .. +6 = 6 × 2 = 12
Adding 22nm to the λmax of 1,3,5-hexatriene as it has 2 alkyl groups and 2 alkoxy groups to form 2,3,4-trimethylhexatriene.
The λmax of 2,3,4-trimethylhexatriene is 280 nm.
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A 2. 0-m wire carrying a current of 0. 60 a is oriented parallel to a uniform magnetic field of 0. 50 t. what is the magnitude of the force it experiences?
The magnitude of the force is(F)= 0 N.
How can we calculate the value of the magnitude of the force?To calculate the force here we use the formula,
[tex]F= I \times L \times B \times sin\theta[/tex]
Here we are given,
I= The current passing through the wire = 0.60A.
L= The length of the wire= 2.0 m.
B= The magnetic field created by the wire= 0.50T.
[tex]\theta[/tex]= The angle that the wire makes after orientation= 0° (because its orientation is parallel).
We have to find the magnitude of the force = F
Now, we substitute the known values in the above equation,
[tex]F= I \times L \times B \times sin\theta[/tex]
Or, [tex]F= 0.60 \times 2.0 \times 0.50 \times sin (0)[/tex]
Or, F=0
Now from the above calculation we can conclude that, the magnitude of force is 0 N.
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What is the surface tension of water? of rubbing alcohol? was your prediction correct or incorrect?
Rubbing water (isopropyl alcohol) has lesser surface tension than that water.
Water possesses a surface tension of 72 dynes/cm.
Whereas rubbing alcohol has a surface tension of 23 dynes/cm.
what is surface tension?Surface tension is the propensity of liquid surfaces at rest to shrink to the smallest possible surface area.
Because the atoms on the outside of the molecules (often hydrogens) lack strong hydrogen bonding capabilities, most organic liquids have very low surface tensions. Because isopropanol contains just 28%, OH and the remainder is CH or CH3, the linkages that hold a droplet together are few and far between.
The only substance with a higher surface tension than water is liquid mercury (450 dyne/cm).
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convert 0.74ev to joules
A mass m is attached to an ideal massless spring with spring constant k. In experiment 1 the mass oscillates with amplitude a, and period t. A student grabs the mass and brings it to rest before starting experiment 2. In experiment 2, the mass is set to oscillate with a larger amplitude of 3a. What is the period of the oscillation in experiment 2?.
The experiment's time period is unaffected by the change in amplitude in either experiment.
What are the variables that affect time in SHM?The time frame is provided by:
[tex]$T=2 \pi \sqrt{\frac{m}{k}}$[/tex]
where,
T = Time period.
M = mass.
k = spring constant.
We can see from the formula above that the only factors affecting the time period in a Simple Harmonic Motion (SHM) are the object's mass and spring constant. Any changes in the object's mass or the spring constant will cause the time period to adapt.
Describe the Spring Constant.The attribute is known as a spring's "spring constant" describes the relationship between the force acting on a spring and the displacement it causes. In other terms, it describes the stiffness and size of a spring's range of motion.
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the quantities that have only magnitude are called vector quantities.(T or F)
Answer:
F
Explanation:
When comparing two vector quantities you have to compare both magnitude and direction,but for scalar you only compare magnitude
❄ Hi there,
the answer is F, false.
∵
Vectors have both magnitude and direction, where:
magnitude = length of the arrow that represents the vector
direction = angle
∴ quantities that have only magnitude are not called vector quantities
❄
What pressure will 14. 0 g of co exert in a 3. 5 l container at 75°c?
a) 4. 1 atm
b) 5. 0 atm
c) 6. 4 atm
d) 1. 1 atm
The pressure will 14. 0 g of co exert in a 3. 5 l container at 75°c is 4.1atm.
Therefore, option A is correct option.
Given,
Mass m = 14g
Volume= 3.5L
Temperature T= 75+273 = 348 K
Molar mass of CO = 28g/mol
Universal gas constant R= 0.082057L
Number of moles in 14 g of CO is
n= mass/ molar mass
= 14/28
= 0.5 mol
As we know that
PV= nRT
P × 3.5 = 0.5 × 0.082057 × 348
P × 3.5 = 14.277
P = 14.277/3.5
P = 4.0794 atm
P = 4.1 atm.
Thus we concluded that the pressure will 14. 0 g of co exert in a 3. 5 l container at 75°c is 4.1atm.
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Present Your Findings
Write a summary paragraph discussing this experiment and the results. Use the following questions to help guide the content of your paragraph.
What was your hypothesis? According to your data, was your hypothesis was correct?
Why did some substances require larger additions before a color change was seen? What does this indicate about the strength of the acid or base?
What happened in the final step of the experiment? What does the final color indicate?
To what extent was this experiment useful in determining pH? Could a specific pH be determined using this procedure?
Why are acid and base indicators important? How could they be used in everyday life?
The sample summary paragraph which discusses an experiment and the results based on the reason why some substances require larger additions before a color change was seen is given below:
If the substance has a weak base solution (pH=8) and you add phenolphthalein, for example, you would only see a pink color change if a lot of phenolphthalein because it is used for stronger bases.
Also, when phenolphthalein is added to acids and weak bases, they tend to have a colorless coloration.
However, if phenolphthalein is added to a strong base, there would be a color change that is noticeable and it would be changed to pink.
What is a Strong Base?This refers to the compound that has the ability to remove a proton from a very weak acid.
Hence, we can see that a summary paragraph is given above based on the use of large addition of elements to some substances before there is a noticeable color change is mentioned above.
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What is the frequency in hertz of a signal that repeats 80,000 times within one minute? What is its period?
1333.3 is the frequency in the hertz of a signal that repeats 80,000 times within one minute. 0.00075 is its period.
The frequency of a repeated event is its number of instances per unit of time. In some cases, it is also referred to as temporal frequency or ordinary frequency to underline differences with spatial and angular frequencies, respectively.
The length of time it takes for a particle in a medium to complete one full vibrational cycle is the period of a wave. Being a time, a period is measured in time units like seconds, hours, days, or years. The Earth's orbit around the Sun has a duration of around 365 days, and one cycle of the Earth lasts 365 days.
frequency = cycle /second
frequency = 80000 / 60
frequency = 1333.3 hertz
Period = 1 / frequency
Period = 1 / 1,333.3
Period = 0.00075
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The henry's law constant for n2 is 6. 2×10−4matm at 25∘c. what pressure of nitrogen is needed to maintain a n2 concentration of 0. 53 m?
The pressure of nitrogen which is needed to maintain a N2 concentration of 0. 53 m is 3.2 × 10^(4).
What is pressure?It is defined as the continuous physical force applied on or against an object by something which is in contact with it.
It is also defined as the force per unit area.
What is henry's law?The henry law constant is thr ratio of the partial pressure of compound in air to the concentration of compound in water at given temperature.
C= kp
where,
C is the concentration of compound = 0.53m
k is the henry constant = 6. 2×10−4matm
p is the pressure of compound
By substituting all the value we get,
C = 6. 2×10−4 × p
0.53 = 6. 2×10−4 × p
p = 0.53/6. 2×10−4
p = 3.2 × 10^(4)
Thus we find that the pressure needed to maintain a N2 concentration of 0. 53 m is 3.2 × 10^(4).
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A charge of 2 c is at the origin. when charge q is placed at 2 m along the positive x axis, the electric field at 2 m along the negative x axis becomes zero. what is the value of q?
The value of Q will be -8 C.
In the presence of an electric or magnetic field, matter experiences a force due to its electric charge.
A moving electric charge generates a magnetic field, and an electric charge has an accompanying electric field.
The information provided in the issue is;
The separation between and is 2m.
The separation between and is 2m.
An origin charge equals +2 C
The electric fields are identical in magnitude but are facing in different directions. As a result, the following relationship can be used
Q/16=1/2
The value of Q will be -8 C.
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Th value of q is= -8C
How can we calculate the value of the q?Here, To calculate the value of q we use the formula,
The E-field due to a point charge = [tex]\frac{k\times Q}{D^{2} }[/tex]
Here we are given,
D= the distance along the axes.
k= The coulomb's constant.
We have to find, the charge along the axes = Q
Now, we have to substitute the known values in that equation for the cases,
For the E-field at x=-2 to equal 0, the E-fields from both charges must be equal in magnitude and opposite in direction.
For the first case, E from +2C charge = [tex]\frac{k\times Q}{D^{2} }[/tex] = [tex]\frac{k\times (+2C)}{2^{2} }[/tex]=[tex]\frac{k\times (+2C)}{4 }[/tex].
For the second case, E from Q charge= [tex]\frac{-k\times Q}{D^{2} }[/tex]=[tex]\frac{-k\times Q}{(2+2)^{2} }[/tex]=[tex]\frac{-k\times Q}{16 }[/tex].
Now, Comparing the two cases we can find that,
[tex]\frac{k\times (+2C)}{4 }=\frac{-k\times (Q)}{16}[/tex]
Or,[tex]\frac{+2C}{4}= \frac{-Q}{16}[/tex] (Eliminate k from both sides of the equation.)
Or,[tex]Q=-8C[/tex]
So, from the above calculation we can conclude that,
The value of q is -8C.
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An object is dropped from the top of a building and is observed to take 7. 2s to hit the ground. How tall is the building?.
the height of the building is H=36 m.
What is The Law of Gravity?According to Newton's law of gravity, every particle of matter in the universe is attracted to every other particle with a force that varies directly as the product of their masses and inversely as their distance from one another.
Properties of Gravity -
It is a universal attractive force. It is directly proportional to the product of the masses of the two bodies. It obey inverse square law. It is the weakest force known in nature.Examples of Gravity -
The force that holds the gases in the sun.The force that causes a ball you throw in the air to come down again.The force that causes a car to coast downhill even when you aren't stepping on the gas.v₀=0 m/s
H₀=0 m
g=10 m/s²
t=7,2 s
H - ?
[tex]H= H_{0} + v_{0}t+\frac{gt^{2} }{2} \\[/tex]
H = 0 +0 × 7.2 + 10(7.2)²/2
H = 36m
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Three origin, the identical second point to the charges right of atx 2.0 hc 50 cm, are and placed the on thrd the 1s at x-axis. the 100 the cm first mark. charge 15 what at are the the magnitude le and direction of the electrostatic torce which acts on the charge at the or ongin?
The magnitude and direction of the electrostatic torce is - 0.00712 x 10^9N towards left direction
Given:
q1 = +2 uC
q2 = -2 uC
q3 = +4 uC
To Find:
magnitude le and direction of the electrostatic torce
Solution: Electric force is a vector quantity. The electric force is proportional to the product of the magnitude of the charges. It is inversely proportional to the square of the distance between the charges. The electric force is calculated by,
F = kqQ/r^2
Force between q1 and q2
F1 = +2 x -2 x k/50 x 50 = - 0.0016k
Force between q1 and q3
F2 = +2 x +4 x k/100 x 100 = + 0.0008k
Net force on charge at origin is F1 + F2
F(net) = F1 + F2 = - 0.0016k + 0.0008k
F(net) = - 0.0008 x 8.9 x 10^9 = - 0.00712 x 10^9N
So, force on charge at origin is - 0.00712 x 10^9N and towards left direction
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An object having a fixed emissivity of 0. 725 radiates heat at a rate of 10 w when it is at an absolute temperature t. If its temperature is doubled to 2t, at what rate will it now radiate?.
It will now emit at a rate of 160 W.
What exactly is emissivity?the proportion of an emitter's energy to that of a blackbody, a perfect emitter with the same temperature, wavelength, and viewing circumstances. It ranges from 0 (for the optimum reflector) to 1 and has no dimensions (for a perfect emitter).
Why is emissivity important and what does it mean?The ability to reliably measure temperature using an infrared temperature sensor or a thermal imaging camera depends critically on emissivity, which measures a material's capacity to radiate infrared energy from its surface.
What substances exhibit a high emissivity?The type of surface affects a surface's emissivity in addition to the material. A smooth and polished metal surface will have a low emissivity in contrast to a roughened and oxidized metal surface, which will have a high emissivity.
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A six volt battery is connected to a three and a six ohm resistor as shown in the circuit diagram. What is the voltage drop across the 6 ohm resistor?
A
1 V
B
3 V
C
6 V
D
12 V
6 V drop occurs across the 6 ohm resistor in the parallel circuit diagram. The correct answer is C.
Since this parallel combination is connected with a cell, the potential difference through each resistor will be 6 volts. Now using I=V/R,
Current through 3 ohm resistor = 6/3 = 2 V
Current through 6 ohm resistor = 6/6 = 1 V
And the total current will be the sum of individual current in each resistor using Kirchoff’s junction law, Total current = 3 ampere
Since it is parallel combination the current passing across two resistors can differ but the voltage drop will remain the same.
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How fast isn’t a ball going when it hits the ground after being dropped from a height of 9 m? the acceleration of gravity is 9.8 m/s2
Answer:13,3 m/s
Explanation:We can use the Torricelli equation:
v^2=v0^2+2ah
the initial velocity is 0
v0^2=0
so:
v^2=0+2*9,8*9
v^2=176,4
v=13,3 (approx)
Answer:
For me i think the answer will be 13.72m/s
A race car traveling northward on a straight, level track at a constant speed travels 0.760 km in 21.0 s. The return trip over the
same track is made in 26.0 s.
(a) What is the average velocity of the car in m/s for the first leg of the run?
m/s
(b) What is the average velocity (in m/s) for the total trip?
m/s
The average velocity of the car in m/s for the first leg is 36.2 m/s and the average velocity (in m/s) for the total trip is 7 m/s
What is Speed and Velocity ?Speed is the distance travelled per time taken. The S.I unit is m/s. The average speed is the ratio of the total distance travelled to the to time taken. While velocity is the distance travelled in a specific direction per time taken
Given that a race car traveling northward on a straight, level track at a constant speed travels 0.760 km in 21.0 s. The return trip over the same track is made in 26.0 s.
(a) The average velocity of the car in m/s for the first leg of the run will be
Velocity = (0.760 x 1000)/ 21
Velocity = 760 / 21
Velocity = 36.2 m/s
(b) The average velocity (in m/s) for the total trip will be
36.2 - (0.760 x 1000)/ 26
36.2 - (760) / 26
36.2 - 29.2
7 m/s
Therefore, the average velocity of the car in m/s for the first leg is 36.2 m/s and the average velocity (in m/s) for the total trip is 7 m/s
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In a particular chemical reaction, the energy of the reactants is 30 kJ and the energy of the products is 5 kJ. The maximum energy of the system is 40 kJ.
Sketch a potential energy diagram for this reaction. Make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.
What is the activation energy for this reaction?
What is the enthalpy change for this reaction?
Is this reaction endothermic or exothermic? Explain your answer in two ways: first, using the energy values, and second, by referring to the shape of the graph.
The coating on the head of a match is highly flammable. When it burns, it releases a great deal of energy. However, before the match can burn, it must gain a small amount of energy from a spark. That spark is typically produced by striking (rubbing) the match head against a rough surface. Sketch and describe a potential energy diagram that represents the striking and burning of the match. Remember to label the diagram with the energy changes that occur. Your answer must include the potential energy diagram and a written description. (Note: you do not have to use actual energy values.)
An energy of 25kJ is given out hence the reaction is exothermic.
What is a reaction?Chemical reaction is said to occur when reactants combine leading to the formation of products. In a plot of the energy against the reaction profile, the topmost point of the graph is called the activation energy.
We know that a reaction is exothermic when reactants posses more energy than the products. Hence the enthalpy change for this reaction is;
ΔH = 5kJ - 30kJ = -25kJ thus the reaction is an exothermic reaction.
Now, the activation energy for the lighting of the match stick is high that is why a spark is required before the reaction gets underway. Heat is evolved in the process hence the reaction is exothermic. The energy of the reactants is greater than the energy of the products.
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A baseball pitcher throws a fastball with a 100 ns impulse. if he applied the force in 0. 15 seconds, what force did he apply?
Answer:
The force he will apply is 666.667 N
Explanation:
The impulse is given as the product of Force and time:
Impulse (I) = F * t
As we are provided with the impulse and that is:
I = 100 ns and t = 0.15 s
So, required force is:
F = I/t
F = 100/0.15
F = 666.6667 N
Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7?
The star with apparent magnitude 2 is more brighter than 7.
To find the answer, we have to know about apparent magnitude.
What is apparent magnitude?100 times as luminous as a star with an apparent brightness of 7 is a star with a magnitude of 2. The apparent magnitude of bigger stars is always smaller. The brightest star in the night sky is Sirius. The brightness of a star or other celestial object perceived from Earth is measured in apparent magnitude (m). The apparent magnitude of an object is determined by its inherent luminosity, its distance from Earth, and any light extinction brought on by interstellar dust in the path of the observer's line of sight.Thus, we can conclude that, the star with apparent magnitude 2 is more brighter than 7.
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I have provided a picture of the question
Answer:
Explanation:
Formula
Electric Force formula
F = k * q1 * q2 / r^2
Gravitation Force Formula
F = G * m1 * m2 / r^2
Givens
k = 8.99 * 10^9 N m^2/C^2
N = newtons (units of force.m = metersc = coulombs (units of charge.G = 6.67 * 10^-11 N m^2 /kg^2
c_e = c_p = 1.6 * 19 Charge electron / Charge Protonm_e = 9.11 * 10^-31 Mass Electronm_p = 1.67 * 10^27 Mass ProtonSolutions
Fe = 8.99 * 10^9 * 1.6 * 10^-19 ^2/ 8.4 * 10^-11
The force = the electric force constant * the charge of the proton*charge electron/ distance apart in meters. It looks small but actually it is quite large in comparison to the Gravitational Force
Fe = 3.2 * 10^-8 (Answer First Box)
Fg = 6.67 * 10^- 11 * 9.11*10^-31 * 1.67*10^-27 / 8.4 * 10^-11
The gravitational Force is very small. Just look at the powers which come to 10^-68 - -22 = - 46 which is about 6 times smaller than the electric force.
Fg = 1.44 * 10^-47 (Answer Second Box)
Glycerin at a temperature of 30 degrees celcius flows at a rate of 8×10−6m3/sthrougha horizontal tube with a 30mmdiameter. what is the pressure drop in pascals per100m?
The pressure drop in pascal is 3.824*10^4 Pascals.
To find the answer, we need to know about the Poiseuille's formula.
How to find the pressure drop in pascal?We have the Poiseuille's formula,[tex]Q=\frac{\pi r^4P}{8\beta l}[/tex]
where, Q is the rate of flow, P is the pressure drop, r is the radius of the pipe, is the coefficient of viscosity (0.95Pas-s for Glycerin) and l being the length of the tube.By substituting values and rearranging we will get the pressure drop as,[tex]P=3.284Pascals[/tex]
Thus, we can conclude that, the pressure drop in pascal is 3.824*10^4.
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Discuss how friction is reduced in oce skating
Answer:
below
Explanation:
Ice melts, meaning it has a watery layer upon its surface. This allows things to be moving like they are on a liquid but it has the solidity of a solid. The thin metal of the ice skates also decrease the surface area meaning it exerts more force but in turn, it allows you to move faster and further reduces friction.
19. when the wave speed increases, will the wavelength need to increase, decrease or stay the same to get the same standing wave pattern (such as the one with 3 antinodes)?
When the wave speed increases the wave stay the same to get the same standing wave pattern
Standing wave are the combination of two waves moving in opposite directions . Amplitude of both the waves is same and frequency is also same . The phenomenon is the result of interference
Wavelength and frequency are inversely related to each other .
frequency = c / wavelength
so if one get change then the other changes. As one get decrease other will increase and vise versa. . The speed of the wave depends on the medium. Change in the frequency of the wave changes its form to go into the next harmonic so the wavelength changes .Also in order to maintain the wave pattern the wavelength remain same
Hence , speed of wave will not affect the wavelength of wave.
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What is the mass of an object that experiences a gravitational force of 685 n near earth's surface where g = 9.80 m/s2?
The mass of an object that experiences a gravitational force of 685 N near earth's surface where g = 9.80 m/s² is 98.89 kg.
What is gravitational force?Any two mass-containing objects are attracted to one another by the gravitational force. Because it consistently attempts to pull masses together rather than pushing them apart, the gravitational force is known as attractive.
In reality, everything in the cosmos is tugging on everything else, including you!
According to the question,
The gravitational force of 685 N near earth's surface.
The acceleration due to gravity is g = 9.80 m/s².
The formula for force acting of the body under the influence of gravitation is ;
Force = mass×acceleration
Substitute the given values;
685 = m×9.8
m = 685/9.8
m = 69.89 kg.
Therefore, mass of an object is 69.89 kg.
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An ordinary car battery has a charge of 13 volts. When starting the car, the battery delivers about 600 amperes to the car motor. What is the resistance of this circuit?
A
46.15 ohms
B
0.02166 ohms
C
600 ohms
D
7800 ohms
Answer:B
0.02166 ohms
Explanation:
Answer:
Explanation:
Formula
Voltage (volts) = current (amps) * resistance (0hms). The terms in brackets are the units.
Givens
V = 13 volts
I = 600 amps
R = ? ohms
Solution
V = I * R
13 = 600 * R Divide both sides by 600
13/600 = 600R/600 Do the division
0.0216 ohms = R This is almost a dead short.
Answer
R = 0.0216
Part a a calorimeter consists of an aluminum cup inside of an insulated container. The cup is weighed on a top-loading balance and is found to have a mass of 31. 91 g. A reaction is conducted in the calorimeter, raising the temperature from 21. 2 c to 26. 1 c what is the change in heat q for the aluminum cup in units of j? aluminum has a specific heat of 0. 903 j 1 ? 1 write your answer to the correct number of significant figures.
The change in heat q for the aluminum cup is 141 J.
What is Specific heat?A substance's heat capacity is the amount of heat needed to increase its overall temperature by one degree. The heat capacity is known as the specific heat capacity or the specific heat if the substance's mass is unity.
change in heat -
The amount of heat Q that is transported to create a temperature shift depends on the substance and phase involved, the mass of the system, and the magnitude of the temperature change. (A) The temperature change and the amount of heat transported are directly inversely related.
The answer's sign dig is determined by a calculation's lowest sign digits.
The solution will need 3 digits because the temperatures are provided with 3 significant digits and the specified heat has 3 significant digits (the mass has 4 significant digits).
31.91 g * 0.903 J/g-C * (26.1 - 21.2 C) = 141 J
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Ice at 0. 0∘c has a density of 917 kg/m3. a 3. 00 cm3 ice cube is gently released inside a small container filled with oil and is observed to be neutrally buoyant. what is the density of the oil, rhooil?
The density of the oil is 917kg/ m³.
An object is said to be naturally buoyant when ithas the tendency to float in a fluid.
from the law of floating when a body float in a liquid,the weight of the liquid displaced by its immersed part is equal to the total weight of body.
That is
weight (w)=upthrust (u)
w=u
therefore
u=Dvg
where, D= density of the ice
v= volume of ice
g= acceleration due to gravity
from the question
given:
D = 917kg/m {}^{3} [/tex]
v = 3.00cm {}^{3} [/tex]
g = 9.8m/s {}^{2} [/tex]
substitute these values in above equation
u = 917(3 \times 10 {}^{ - 6} )(9.8)[/tex]
u=0.027N
but,
upthrust= weight of oil displaced.And the ice will displaced an amount of oil,equal to its own weight.
therefore,
density of oil = u/gv = (0.027)/3 \times 10 {}^{ - 6)} (9.8)[/tex]
density of oil = 917kg/m {}^{3} [/tex]
hence the density of the oil is 917kg/m {}^{3} [/tex]
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Ice cubes float in a glass of iced tea. why would cooling be less if the cubes were instead on the bottom of teh drink?
Ice cubes float in a glass of iced tea because due to a lack of convection, ice cubes will cool more slowly if they are on the bottom. Ice is denser than water at 4° C.
Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids. Conduction is used to move heat from the object to the fluid initially, but the fluid motion is responsible for the bulk of the heat transfer.
Natural convection is caused by the fact that most fluids have a tendency to expand when heated, which causes them to become less dense and rise due to the increased buoyancy. Heat is transferred between two bodies by currents of moving gas or fluid, which is known as convection. In free convection, air or water rises and is replaced by a cooler parcel of air or water as it moves away from the hot body.
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When current flow tries to decrease in an inductor, the magnetic field ________ and the voltage polarity across the inductor ________.
When current flow tries to decrease in an inductor, the magnetic field collapses and the voltage polarity across the inductor reverses
The associated magnetic flux also decreases, it then induces an e m f across the inductor, the sense of which is to assist the decreasing current.
Faraday's law of induction (to distinguish it from his laws of electrolysis), states that the magnitude of the emf induced in a circuit is proportional to the rate of change with time t of the magnetic flux Φ that cuts across the circuit:
emf = −dΦ/dt
Lenz's law, in electromagnetism, statement that an induced electric current flows in a direction such that the current opposes the change that induced it.
When the current flowing through the coil changes, the time-varying magnetic field induces an electromotive force (e.m.f) in the conductor, described by Faraday's law of induction.
According to Lenz's law, the induced voltage has a polarity (direction) which opposes the change in current that created it. As a result, inductors oppose any changes in current through them. Hence , polarity across the inductor got reversed
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The wavelength of a transverse wave is the distance between successive crests (or troughs). What is the wavelength of a longitudinal wave?
The distance between adjacent compressions or rarefactions is called the wavelength of the longitudinal waves.
To find the answer, we have to know more about the Longitudinal waves.
What are Longitudinal waves?If the particles in of the medium vibrate in the direction of propagation of the wave, the wave motion is called longitudinal wave motion. These waves are possible in media with bulk modulus, such as solids, liquids and gases.Sound waves are longitudinal waves.Longitudinal wave travel in the form of compressions and rarefactions.A compression is a high-density, high-pressure region and a rarefaction is vice versa.The distance between adjacent compressions or rarefactions is called the wavelength of the longitudinal waves.Thus, we can conclude that, the distance between adjacent compressions or rarefactions is called the wavelength of the longitudinal waves.
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