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Q 3122191031.     In photoelectric effect experiment, inadiation of
a metal with light of frequency `5 xx 10^(20) s^(-1)` yields
electrons with maximum `K.E. = 6.63 xx 10^(-14) J`.
Calculate `v_0` (threshold frequency) for the metal.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)