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A certain metallic surface is illuminate...

A certain metallic surface is illuminated with manochromatic light of wavelength , `lambda`. The stopping potential for photoelectric current for this light is `3V_0` . If 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

`4lambda`

B

`lambda/4`

C

`lambda/4`

D

`6lambda`

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