A metallic surface is illuminated with radiation of wavelength 
, the stopping potential is V 0 . If the same surface is illuminated with radiation of wavelength 2 
, the stopping potential becomes 
. The threshold wavelength for this metallic surface will be
A
3 
B
4 
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let the threshold frequency be 
.
By the equation of photoelectric effect, for wavelength 
…(i)
For the wavelength 2 
,
…(ii)
Dividing (i) by (ii)
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