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

  • question_answer
    Wavelength of a 1 keV photon is \[1.24\times {{10}^{-9}}m\]. What is the frequency of 1 MeV photon          

    A) \[1.24\times {{10}^{15}}Hz\]   

    B) \[2.4\times {{10}^{20}}Hz\]

    C) \[1.24\times {{10}^{18}}Hz\]   

    D) \[2.4\times {{10}^{23}}Hz\]

    Correct Answer: B

    Solution :

    [b] \[E=h\nu \Rightarrow \nu =\frac{E}{h}=\frac{1\times {{10}^{6}}\times 1.6\times {{10}^{-19}}}{6.6\times {{10}^{-34}}}\] \[=2.4\times {{10}^{20}}Hz\]

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