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Question

Speed of sound in air is found to be 344ms at 80 C. Find the change in speed of sound for a 1 C increase in temperature.


A

1 m/s

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B

0.6 m/s

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C

0.01 m/s

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D

None of these

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Solution

The correct option is D

None of these


Given at 20C v = 344 m/s

T1 = 273 + 20 = 293 k

T2 = T1 + ∆T

v1= 344

Let v2 = v1 + ΔV

We know

v2v1=T2T1

v2+Δvv1=T1+ΔTT1

1+Δvv1=1+ΔTT1

1+Δvv1=1+12ΔTT1 (Using approximate)

Δv=12ΔTT1v1=121293 344

= 0.587 Δv = 0.6 ms.


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