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NEET Sample Paper NEET Sample Test Paper-2

  • question_answer
    The ratio of de-Broglie wavelength of molecules of Hydrogen and helium which are at temperature \[{{27}^{o}}C\] and \[{{127}^{o}}C\] respectively will be

    A)  \[\sqrt{\frac{4}{3}}\]                   

    B)  \[\sqrt{\frac{8}{3}}\]

    C)  \[\sqrt{\frac{3}{8}}\]                 

    D)  \[\sqrt{\frac{2}{4}}\]

    Correct Answer: B

    Solution :

    de - Broglie wavelength is given by \[\lambda =\frac{h}{\sqrt{3m\,KT}}\] \[\frac{\lambda {{H}_{2}}}{\lambda {{H}_{e}}}=\sqrt{\frac{{{m}_{He}}{{T}_{He}}}{{{m}_{{{H}_{2}}}}{{T}_{{{H}_{2}}}}}}=\sqrt{\frac{8}{3}}\]


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