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Question

When a metallic surface is illuminate with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is V4. The threshold wavelength for the metallic surface is:
  1. 4λ
  2. 5λ
  3. 52λ
  4. 3λ

A
5λ
B
4λ
C
3λ
D
52λ
Solution
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We know that:
eV=hcλϕ ........ (1)

eV4=hc2λϕ ........ (2)

From equations (1) and (2), we get:

4=1λ1λ012λ1λ0

λ0=3λ

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