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When a certain metallic surface is illuminated with mono chromatic light of wavelength `lambda`, the stopping potential for photoelectric current is `3V_(0)`. When the same surface is illuminated with light of wavelength `2lambda` the stopping potential is `V_(0)`. The threshold wavelength for this surface for photoelectric effect is.

A

`6 lambda`

B

`4 lambda`

C

`(4 lambda)/3`

D

`8 lambda`

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The correct Answer is:
B
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