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The work function of a metal is 2.56 x 10-19J. Ca...

The work function of a metal is 2.56 x 10-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10-19J, h = 6.6 x 10-34Js]

A.

5.56 x 1019Hz

B.

1.66 x 1019Hz

C.

1.12 x 1015Hz

D.

8.42 x 1014Hz

Correct answer is C

F = K.E+Woh

= 3.0×1.6×1019+2.56×106196.6×10634

- 1.12 x 10-15HZ