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9th Class Science Sound Question Bank Sound

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    The speed of sound waves in an atmosphere of helium at \[0{}^\circ C\] and 1 aim. Pressures is (4g helium under STP has a volume of \[22.4\]liter  and \[\lambda =1.67\]for He)                

    A)  1073 m/sec      

    B)  973 m/sec      

    C)  873 m/sec         

    D)  773 m/sec    

    Correct Answer: B

    Solution :

                    \[v=\sqrt{\frac{\gamma P}{d}}=\sqrt{\frac{\gamma PV}{M}}\]                   \[=\sqrt{\frac{1.67\times (1.013\times {{10}^{5}})(22.4\times {{10}^{-3}})}{4\times {{10}^{-3}}}}\]                   \[=973\,\,m/\sec \]


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