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When a certain metallic surface is illum...

When a certain metallic surface is illuminated with monochromatic light of wavelength `lambda`, the stopping potential for photo electric current is `6 v_(0)`. When the same surface si illuminated with light of wavelength `2 lambda`, the stopping potential is `2v_(0)`. The threshold wavelength of this surface for photoelectric effect is -

A

`6 lambda`

B

`4 lambda//3`

C

`4lambda`

D

`8lambda`

Text Solution

Verified by Experts

The correct Answer is:
C
`(e(6V_(0)))/(e(2V_(0))) = ((hc)/(lambda) - phi)/((hc)/(2lambda) - phi) rArr lambda_(0) = 4lambda`
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Knowledge Check

  • When a certain metallic surface is illuminated with monochromatic light of wavelength lamda , the stopping potential for photoelectric current is 3V_0 and when the same surface is illuminated with light of wavelength 2lamda , the stopping potential is V_0 . The threshold wavelength of this surface for photoelectrice effect is

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