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

  • question_answer
    In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be [MP PET 1995]

    A)            2 V

    B)            Less than 2 V

    C)            Zero                                         

    D)            Greater than 2 V

    Correct Answer: D

    Solution :

                       According to Einstein's photoelectric equation                    \[E={{W}_{0}}+{{K}_{\max }}\] \[\Rightarrow \,\,{{V}_{0}}=\frac{hc}{e}\,\left[ \frac{1}{\lambda }-\frac{1}{{{\lambda }_{0}}} \right]\]            Hence if l decreases \[{{V}_{0}}\] increases.


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