# Energy of ejected electrons

A magnesium surface has a work function of 3.68 eV. Electromagnetic waves with a wavelength of 215 nm strike the surface and eject electrons. Find the maximum kinetic energy of the ejected electrons. Express your answer in electron volts.

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#### Solution Preview

Electromagnetic waves with a wavelength of 215 nm have energy=

E=hf

where

h= Planck's constant= 6.63E-34 J s

f=frequency= c/ wavelength;

wavelength= 215 nm= 2.15E-07 m

c= speed ...

#### Solution Summary

The solution calculates the kinetic energy of ejected electrons when electromagnetic waves strike the surface.

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