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When a certain metallic surface is illum...

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

`4 lambda`

B

`2 lambda`

C

`6 lambda`

D

`3 lambda`

Text Solution

Verified by Experts

The correct Answer is:
1
`eV_(0)=hc[(1)/(lambda)-(1)/(lambda_(0))],3V_(0)=(hc)/(e)[(1)/(lambda)-(1)/(lambda_(0)],V_(0)=(he)/(e)[(1)/(2lambda)-(1)/(lambda_(0))`]
on dividing and solving `lambda_(0) = 4 lambda`.
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Knowledge Check

  • 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 -

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