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MHT CET202121 Sep 2021Evening ShiftPhysicsWaves and SoundActual

What is the ratio of the velocity of sound in hydrogen ( = 7 5 ) to that in helium ( = 5 3 ) at the same temperature? (Molecular weight of hydrogen and helium is 2 and 4 respectively)

Options

  1. A42 5
  2. B5 42
  3. C21 5
  4. D5 21

Correct answer

A. 42 5

Step-by-step solution

Velocity of sound is given by V = RT M V _ H V _ He = _ H _ He M _ He M _ H ( T is the same for both) = 7 5 3 5 4 2 = 42 5

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