Question

4.3 eV is observed to be the work function of a certain metal. the threshold frequency of photo electric emmition from the metal is what?
a,1.830×10^16
b,1.380×10^16
c,1038×10^15
d,1.308×10^14
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Answer 1

Answer:

The work function of a metal is 2 eV. If a radiation of wavelength 3000 A˚ is incident on it, the maximum kinetic energy of the emitted photoelectrons is : (Planck's constant h=6. 6×10−34Js; Velocity of light c=3×108m/s;1eV=1.