NEET Sample Paper NEET Sample Test Paper-51

  • question_answer In a photoelectric effect experiment, the maximum kinetic energy of the ejected photoelectrons is measured for various wavelengths of the incident light. Figure shows a graph of this maximum kinetic energy \[{{K}_{max}}\] as a function of the wavelength \[\lambda \] of the light falling on the surface of the metal. Which of the following statement is/are correct?
    [a] Threshold frequency for the metal is \[1.2\,\,\times \,\,{{10}^{15}}Hz\]
    [b] Work function of the metal is \[4.968\text{ }eV\]
    [c] Maximum kinetic energy of photoelectrons corresponding to light of wavelength 100 nm is nearly \[7.4\text{ }eV\]
    [d] Photoelectric effect takes place with red light

    A) a, b                              

    B) a, b, c

    C) a, b, c, d                      

    D) a, c, d

    Correct Answer: B

    Solution :

    \[\frac{hc}{{{\lambda }_{0}}}\] \[\frac{hc}{\lambda }\,\,=\,\,\frac{hc}{{{\lambda }_{0}}}\,\,+\,\,K.{{E}_{\max }}\]

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