Sound travels in a mixture of two moles of helium and n moles of hydrogen. If rms speed of gas molecules in the mixture is 2 time the speed of sound, then the value of n will be

Option 1 -

1

Option 2 -

2

Option 3 -

3

Option 4 -

5

0 2 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • P

    Answered by

    Payal Gupta | Contributor-Level 10

    2 months ago
    Correct Option - 2


    Detailed Solution:

    As we know that

    v=γRTM Speed of sound in a gas, and

    vrms=3RTM Rms speed of gas molecules, so

    vrms=2v3RTM=2γRTMγ=32

    According formula of specific heat ratio of mixture, we can write

     5n = 14 n = 2.8

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