When a surface 1 cm thick is illuminated with light of wavelength λ, the stopping potential is 
. But when the same surface is illuminated by light of wavelength 3λ, the stopping potential is 
, the threshold wavelength for metallic surface is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
From Einstein's photoelectric equation, we have
…… ..(i)
……… (ii)
On dividing Eq. (i) by Eq. (ii), we get
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