A certain metallic surface is illuminate...

A certain metallic surface is illuminated with monochromatic light of wavelength `lambda`. The stopping potential for photoelectric current for this light is `3V_(@)`. 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 effiect is

`6 lambda`

`4 lambda//3`

`4lambda`

`8lambda`

Text Solution

Verified by Experts

The correct Answer is:

`(e(6V_(0)))/(e(2V_(0))) = ((hc)/(lambda) - phi)/((hc)/(2lambda) - phi) rArr lambda_(0) = 4lambda`

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