2. Solved Papers
  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2008

  • question_answer
    The threshold wavelength for photoelectric emission from a material is \[4800\overset{\text{o}}{\mathop{\text{A}}}\,\] . Photoelectrons will be emitted from the material, when it is illuminated with light from a

    A)  40 W blue lamp

    B)  40 W green lamp

    C)  100 W red lamp

    D)  100 W yellow lamp

    E)  1000 W green lamp

    Correct Answer: A

    Solution :

    The wavelength of blue light is\[4800{\AA},\]so material will emit photoelectrons when it is illuminated with light from a 40 W blue lamp.


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