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A surface receives light of wavelength l...

A surface receives light of wavelength `lambda_1=450` nm, causing the ejection of photo-electrons for which the stopping potential is `V_(S_1)=0.2 V.` If the radiations of wavelength `lambda_2=120` nm are now incident on the surface, the threshold frequency for the surface is

A

`2.4 xx10^13 Hz`

B

`4.3xx10^13 Hz`

C

`6.2 xx10^14Hz`

D

`8.5 xx10^14 Hz`

Text Solution

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The correct Answer is:
C
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