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In a photoelectric effect measurement, the stopping potential for a given metal is found to be V 0 volt when radiation of wavelength λ 0 is used. If radiation of wavelength 2 λ 0 is used with the same metal then the stopping potential (in volt ) will be

Options

  1. AV 0 2
  2. B2 V 0  
  3. CV 0 + hc 2 eλ 0
  4. DV 0 - hc 2 eλ 0

Correct answer

D. V 0 - hc 2 eλ 0

Step-by-step solution

From Einstein's photoelectric equation eV 0 = hc λ 0 - W 0 eV ′ = hc 2 λ 0 - W 0 Subtracting e V 0 - V ′ = hc λ 0 1 - 1 2 = hc 2 λ 0 or V ′ = V 0 - hc 2 eλ 0

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