JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Topic Test - Photo Electric Effect, X-Rays & Matter Waves

  • question_answer
    Light of wavelength 4000 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] is incident on a sodium surface for which the threshold wave length of photo – electrons is 5420 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]. The work function of sodium is   

    A) 4.58 eV

    B) 2.29 eV

    C) 1.14 eV

    D) 0.57 eV

    Correct Answer: B

    Solution :

    [b] \[{{W}_{0}}=\frac{12375}{{{\lambda }_{0}}(\overset{\text{o}}{\mathop{\text{A}}}\,)}=\frac{12375}{5420}=2.29eV\]

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