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Question

The K.E of the photoelectons is E when the incident wave length is λ2. The K.E becomes 2E when the incident wave length is λ3. The work function of the metal is
  1. hcλ
  2. 3hcλ
  3. 2hcλ
  4. hc3λ

A
3hcλ
B
2hcλ
C
hc3λ
D
hcλ
Solution
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Let work function be W
For first case,
2hCλW=E ---------------------------(I)

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