The velocity of sound in air is affected by change in the I. Moisture content of air II. Temperature of air III. Composition of air IV. Atmospheric pressure Choose the correct answer.a)I, II and IIIb)II, III and IVc)I, II and IVd)I, III and IVCorrect answer is option 'A'. Can you explain this answer?

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The velocity of sound in air is affected by change in the

I. Moisture content of air

II. Temperature of air

III. Composition of air

IV. Atmospheric pressure

Choose the correct answer.

a)
I, II and III
b)
II, III and IV
c)
I, II and IV
d)
I, III and IV

Correct answer is option 'A'. Can you explain this answer?

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Verified Answer

The velocity of sound in air is affected by change in the I. Moisture ...

Concept:

During the day the sun heats up the earth's surface, warming the air close to the ground.
Sound travels faster in warmer air
. So the sound travels faster in the air close to the ground.
The reverse happens at night.
The speed of the sound in air is given by,
$v = \sqrt{\frac{γ R T}{M}}$
where M = molecular mass of the air, R = Universal gas constant, T = temperature, γ = adiabatic index
In terms of density, speed,
, where β = bulk modulus, ρ = density

Explanation:

The speed of the sound in air is given by,

In terms of density and bulk modulus,

From the above expression, the speed of the sound is depended on the following factors,

The temperature
density: The composition of the air and the humidity(moisture) change the density
The speed is almost independent of the atmospheric pressure.

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The velocity of sound in air is affected by change in the I. Moisture content of air II. Temperature of air III. Composition of air IV. Atmospheric pressure Choose the correct answer.a)I, II and IIIb)II, III and IVc)I, II and IVd)I, III and IVCorrect answer is option 'A'. Can you explain this answer?

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