When a piece of metal is illuminated by a monochromatic light of wavelength λ, then stopping potential is 3Vs. When same surface is illuminated by light of wavelength 2λ, then stopping potential becomes Vs. The value of threshold wavelength for photoelectric emission will be

Options

(a) (4λ)/3
(b) 6λ
(c) 4λ
(d) 8λ

Correct Answer:

4λ

Explanation:

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