When 1 cm thick surface is illuminated with light of wavelength λ, the stopping potential is V. When the same surface is illuminated by light of wavelength 2λ, the stopping potential is 
. Threshold wavelength for metallic surface is
A
B
4λ
C
6λ
D
Text Solution
Verified by ExpertsThe correct answer is:
B
According to the question,
……… (i)
and 
……… (ii)
Dividing Eq. (i) by Eq. (ii), we get
or 
or 
or 
Threshold wavelength for metallic surface, 
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