2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Photo Electric Effect, X- Rays & Matter Waves

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

  • question_answer
    A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo-electrons is        [MP PMT 1992]

    A)            4.81 eV                                   

    B)            3.74 eV

    C)            2.66 eV                                   

    D)            1.07 eV

    Correct Answer: C

    Solution :

                       Energy of incident light \[E\,(eV)=\frac{12375}{3320}=3.72\,eV\]                                                                                 \[(332\,nm=3320\,{\AA})\]                    According to the relation \[E={{W}_{0}}+e{{V}_{0}}\]            \[\Rightarrow \,\,{{V}_{0}}=\frac{(E-{{W}_{0}})}{e}=\frac{3.72\,eV-1.07\,eV}{e}\]\[=2.65\,\,Volt.\]


You need to login to perform this action.
You will be redirected in 3 sec spinner