When a photon of light hits the surface of a metal, a photoelectron may be emitt

Question

When a photon of light hits the surface of a metal, a photoelectron may be emitted.

Some of the energy of the photon is required to free the electron from the surface. The remaining energy of the photon becomes the kinetic energy of the electron.

If the minimum (threshold) energy for the emission of an electron from the surface of a particular metal is 6.80 X 10-19 J, what is the kinetic energy of an electron emitted from the surface of the metal when it is irradiated by electromagnetic radiation of wavelength 200 nanometers?

Planck's constant = 6.626 x 10-34 Js
Speed of electromagnetic radiation = 3.0 x 108 ms-1

Kinetic energy of the photoelectron = J

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