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

  • question_answer
    Work function of a metal is 2.1 eV. Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface 

    A) 4000 \[\overset{\text{o}}{\mathop{\text{A}}}\,\], 7500 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    B) 5500 \[\overset{\text{o}}{\mathop{\text{A}}}\,\], 6000 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    C) 4000 \[\overset{\text{o}}{\mathop{\text{A}}}\,\], 6000 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    D) None of these

    Correct Answer: D

    Solution :

    [d] Threshold wavelength \[{{\lambda }_{0}}=\frac{12375}{2.1}=5892.8\,\overset{\text{o}}{\mathop{\text{A}}}\,\]

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