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NEET Physics Photo Electric Effect, X- Rays & Matter Waves NEET PYQ-Photo Electric Effect,X-Rays

  • question_answer
    Light of wavelength \[5000\overset{o}{\mathop{A}}\,\] falls on a sensitive plate with photoelectric work function of 1.9 eV. The kinetic energy of the photoelectron emitted will be:                                      [AIPMT 1998]

    A)  0.58 eV

    B)       2.48 eV

    C)  1.48 eV

    D)  2.68 eV

    Correct Answer: A

    Solution :

    Energy of photon is given by
    \[E=\frac{hc}{\lambda }=\frac{12375}{\lambda \,({\AA})}eV\]
    \[\therefore \]      \[E=\frac{12375}{5000}=2.48\,eV\]
    Einstein’s photoelectric equation is
    \[{{E}_{k}}=E-W\]
    \[=2.48\,eV-1.9\,eV\]
    \[=0.58\,eV\]    


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