When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is 
. The threshold wavelength for the metallic surface is [NEET 2016]
Text Solution
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In Ist case, when a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V.
So, photoelectric equation can be written as
…….(i)
In IInd case, when the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is 
. So, photoelectric equation can be written as
……(ii)
From Eqs. (i) and (ii), we get
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