When a metallic surface is illuminated with radition of wavelength , the stopping potential is V, if the same surface is liiuminated with radiation of wavelength 2, the stopping potential is The threshold wavelength for matallic surface is
(a) 5 (b)
(c) 3 (d) 4
(c) In Ist case, when a matallic surface is illuminated with radiation of wavelength , the stopping potential is V.
So, photoelectric equation can be written as
In IInd Case, when the same surface is illuminayed with radition of wavelength 2, the sopping potential is so, photoelectric equation can be written as
From eqs, (i) and (ii) we get