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JEE Main & Advanced JEE Main Online Paper (Held on 9 April 2013)

  • question_answer
                    Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong?                JEE Main Online Paper (Held On 09 April 2013)

    A)                 X-ray region                                      

    B)                 Ultra violet region                

    C)                       Infrared region                

    D)                        Visible region                

    Correct Answer: B

    Solution :

                    As, \[E=\frac{hc}{\lambda }\]                 and \[\lambda =\frac{hc}{E}=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{11\times 1.6\times {{10}^{-19}}}\]                 hence, UV region                


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