When radiation of wavelength 
is used to illuminate a metallic surface, the stopping potential is 
. When the same surface is illuminated with radiation of wavelength 
, the stopping potential is 
. If the threshold wavelength for the metallic surface is 
, then value of 
will be
Text Solution
Verified by ExpertsThe correct answer is:
D
…… (i)
…… ..(ii)
Multiply Eq. (ii) by 4
…… .(iii)
From Eqs. (i) and (iii),
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