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[" In an experiment on photo electric em...

[" In an experiment on photo electric emission,following observations were "],[" made; "],[" (i) wave length of incident light "=1.98times10^(-7)m],[" (ii) stopping potential "=2.5V" ."],[" Find "(a)" kinetic energy of photo electrons with maximum speed "],[(b)" work function "&(c)" threshold frequency "],[" Ans; "(a)K_(max)=2.5eV(b)" work function "=3.76eV],[" (c) threshold frequency "=9.1times10^(14)Hz]

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