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KVPY Sample Paper KVPY Stream-SX Model Paper-31

  • question_answer
    The root mean square speed of 8 g of \[He\] is \[300\,\,m{{s}^{-\,1}}.\] Total kinetic energy of \[He\]gas is -

    A) 120 J

    B) 240 J

    C) 360 J

    D) None of these

    Correct Answer: C

    Solution :

    \[300=\sqrt{\frac{3RT}{4\times {{10}^{-3}}}};RT=120\]
    Total K.E. of He gas \[=\frac{3}{2}\,\,nRT\]
                            \[=\frac{3}{2}\,\,\times \,\,\frac{8}{2}\,\,\times \,\,120J=360J\]


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