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Find the velocity of an electron emitted by a metal whose threshold frequency is 2.49Ã1014 sâ1 when it is exposed to visible light of wavelength 5.15Ã10â7 m .
Find the velocity of an electron emitted by a metal whose threshold frequency is 2.25X 1014 s-1 when it is exposed to visible light of wavelength 5.00 X 10-7 m