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Stopping potential for a metal when illuminated with light of wavelength λ is V0 and that for wavelength

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Stopping potential for a metal when illuminated with light of wavelength λ is V0 and that for wavelength 2λ is V0/4 . The threshold wavelength of metal is

(1) λ 

(2) 2λ 

(3) 3λ 

(4) 4λ

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Correct option is (3) 3λ 

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