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J & K CET Engineering J and K - CET Engineering Solved Paper-2011

  • question_answer
    The de-Broglie wavelength of a ball of mass  10 g moving with a velocity of \[10\,\text{m}{{\text{s}}^{-1}}\]is \[[h=6.626\times {{10}^{-34}}Js]\]

    A)  \[6.626\times {{10}^{-33}}\,m\]

    B) \[6.626\times {{10}^{-29}}\,m\]

    C)  \[6.626\times {{10}^{-31}}\,m\]

    D)  \[6.626\times {{10}^{-36}}\,m\]

    Correct Answer: A

    Solution :

     \[m=10\,g=0.01\,kg,\,v=10\,m{{s}^{-1}}\] According to de-Broglie equation, \[\lambda =\frac{h}{mv}\] \[=\frac{6.626\times {{10}^{-34}}}{0.01\times 10}\] \[=6.626\times {{10}^{-33}}\,m\]


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