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When a metallic surface is illuminated by a monochromatic light of `lamda` the stopping potential for photoelectric current is `4V_(0)` when the same surface is illuminated by light of wavelength `3 lamda` the stopping potential is`V_(0)`The threshold wavelength for this surface for photoelectric effect is -

A

`4 lamda`

B

`9 lamda`

C

`12 lamda`

D

`16 lamda`

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The correct Answer is:
B
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