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JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Photon and Photoelectric Effect

  • question_answer
    Light of wavelength 1824 Å, incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV. When light of wavelength 1216 Å is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is                                                 [MP PMT 2004]

    A)            3.5 eV                                      

    B)            13.6 eV

    C)            6.8 eV                                      

    D)            1.5 eV

    Correct Answer: D

    Solution :

                       \[E={{W}_{0}}+{{K}_{\max }}\]. From the given data E is 6.78 eV (for l= 1824 \[{\AA}\])  or \[10.17\,eV\,\](for \[\lambda =1216\,\,{\AA}\]) \[\therefore \] \[{{W}_{0}}=E-{{K}_{\max }}=6.78-5.3=1.48\,eV\]                                 or     \[{{W}_{0}}=10.17-8.7=1.47\,eV.\]


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