Photoelectric emission is observed from a surface for frequencies ν1 and ν2 of the incident radiation ν1>ν2 if maximum kinetic energies of the photo electrons in the two cases are in the ratio 1 : K, then the threshold frequency is given by : 

  1. A

    ν2-ν1K-1

  2. B

    2-ν1K-1

  3. C

    2-ν1K

  4. D

    1-ν2K-1

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    Solution:

    E1E2=1-ϕ2-ϕ=1K ϕ=h1-v2K-1= ν=1-ν2K-1   

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