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    Physics-
    General
    Easy

    Question

    The work functions for sodium and copper are 2 e V and 4 e V. Which of them is suitable for a photocell with 4000 text Å end text light

    1. Copper    
    2. Sodium    
    3. Both    
    4. Neither of them    

    The correct answer is: Sodium

      Threshold wavelength for Na, lambda subscript N a end subscript equals fraction numerator 12375 over denominator 2 end fraction equals 6187.5 Å
      Also lambda subscript C u end subscript equals fraction numerator 12375 over denominator 4 end fraction equals 3093.75
      Since lambda subscript N a end subscript greater than 4000 Å; So Na is suitable.

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