The threshold frequency v0for a metal is 7.0X 1014 s-1. Calculate the kinetic energy of an electron emitted when radiation of frequency v= 1.0 X 1015 s-1hits the metal.
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https://www.meritnation.com/ask-answer/question/1-what-are-the-frequency-and-wavelength-of-a-photon-emitted/chemistry/5789730