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The work function of potassium metal is 2.30 eV. Monochromatic light is shined on its surface,...

The work function of potassium metal is 2.30 eV. Monochromatic light is shined on its surface, and photoelectrons with a maximum speed of 5.50E5 m/s are ejected. What is the wavelength of the light?

539nm
658nm
392nm
156nm
1445nm
none of the above
Science   Physics   
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Answer #1

In photoelectric effect, maximum kinetic energy of the photoelectron is given by

where is the work function of the metal.

Substituting the values ,

where

Hence the required wavelength is

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