Light of frequency 70times1014 hz is directed on a


Light of frequency 7.0×1014 Hz is directed on a particular metal surface. An energy of 4.0 × 10-19 J = w is required to remove an electron from the surface of the metal.

a) Find the maximum KE of the emitted electron

b) What color light was used?

c) What color of light will just ionize the metal ( Hint: KE will be zero).

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