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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2003

  • question_answer
    If the wavelength of incident light changes from 400 nm to 300 nm, the stopping potential for photoelectrons emitted from a surface becomes approximately:

    A)  1.0V greater   

    B)         1.0V smaller     

    C)         0.5V greater   

    D)         0.5V smaller

    E)  0. IV greater

    Correct Answer: A

    Solution :

    \[E=\frac{hc}{\lambda }\Rightarrow E\propto \frac{1}{\lambda }\] \[\Rightarrow \]               \[\frac{E}{E}=\frac{400}{300}=1.33\] But\[E=e{{V}_{s}},\text{ }{{V}_{s}}\]being stopping potential. Thus, stopping potential for photoelectrons from a surface becomes approximately 1.0 V greater.


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