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NEET Sample Paper NEET Sample Test Paper-56

  • question_answer
    A body of mass 10 mg is moving with a velocity of\[100\,m{{s}^{-1}}\]. The wavelength of the de-Broglie wave associated with it:

    A) \[6.63\times {{10}^{-7}}\]                    

    B) \[6.63\times {{10}^{-31}}m\]

    C) \[6.63\times {{10}^{-4}}m\]                 

    D) \[6.63\times {{10}^{-35}}m\]

    Correct Answer: B

    Solution :

    [b] \[6.63\times {{10}^{-31}}m\] According to de-broglie equation \[\lambda =\frac{h}{mv}--(1)\] \[m=10mg,V=100m/s,h=6.63\times {{10}^{-34}}kg{{m}^{2}}/s\] \[\lambda =\frac{6.63\times {{10}^{-34}}kg{{m}^{2}}{{S}^{-1}}}{(10\times {{10}^{-6}}kg)(100m/s)}\] \[6.63\times {{10}^{-31}}m\]


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