JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Topic Test - Photo Electric Effect, X-Rays & Matter Waves

  • question_answer
    The wavelength associated with an electron accelerated through a potential difference of 100 V is nearly

    A) 100 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    B) 123 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    C) 1.23 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    D) 0.123 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    Correct Answer: C

    Solution :

    [c] \[\lambda =\frac{h}{\sqrt{2mQV}}=\frac{6.6\times {{10}^{-34}}}{\sqrt{2\times 9.1\times {{10}^{-31}}\times 1.6\times {{10}^{-19}}\times 100}}\]\[=1.23\,\overset{\text{o}}{\mathop{\text{A}}}\,\]

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