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Haryana PMT Haryana PMT Solved Paper-2009

  • question_answer
    The energy of an X-ray photon of wavelength\[1\overset{\text{0}}{\mathop{\text{A}}}\,\,\text{is}\,\text{(h=6}\text{.6 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{34}}}\text{J-s)}\]

    A)  24.6 keV                             

    B)  6.1 keV

    C)  12.3 keV                             

    D)  1.2 keV

    Correct Answer: C

    Solution :

                    The energy of X-ray photon, \[E=\frac{hc}{\lambda }\] \[=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{1\times {{10}^{-10}}}J\] \[=\frac{1.98\times {{10}^{-15}}}{1.6\times {{10}^{-19}}}\] \[=12.3keV\]


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