Q.

Speed of sound wave in a gas is υ1 and r.m.s speed of molecules of the gas at the same temperature is υ2. Then

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a

υ1 = υ2

b

υ1 > υ2

c

υ1  υ2

d

υ1 < υ2

answer is B.

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Detailed Solution

Speed of sound in the gas, v1=γRTM

RMS speed of gas molecule, v2=3RTM

For any gas, γ<3

v1<v2

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