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When a centimeter thick surface is illuminated with light of wavelength λ, stopping potential is V. When the same surface is illuminated by light of wavelength 2 λ, stopping potential is V/3. Threshold wavelength for metallic surface is
  • a)
    4 λ/3
  • b)
    4 λ
  • c)
    6 λ
  • d)
    8 λ/3
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
When a centimeter thick surface is illuminated with light of wavelengt...
Let the threshold wavelength = λ
the energy required by photo electrons to escape = h c/λ
e V + hc/λ = hc/l
e V/3 + hc/λ = hc/2l
=>  h c/l = 4/3 * eV
=>  hc/λ = 1/3 * eV 
=>   λ = 4 l
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When a centimeter thick surface is illuminated with light of wavelength λ, stopping potential is V. When the same surface is illuminated by light of wavelength 2 λ, stopping potential is V/3. Threshold wavelength for metallic surface isa) 4 λ/3 b) 4 λ c) 6 λ d) 8 λ/3 Correct answer is option 'B'. Can you explain this answer?
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