Q.

The temperature at which the speed of sound in air becomes double of its value at 27oC is

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a

54oC

b

327oC

c

927oC

d

−123oC

answer is C.

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Detailed Solution

v=γRTM⇒v∝T i.e. if v is doubled then T becomes four times, hence T2=4T1=4(273+27)=1200K=927°C
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