Calculate the kinetic energy in units of electron volts for an electron emitted from a surface with a work function of 1.5 ev that has been illuminated with632.8-nm (red) helium neon laser, such as those used in a supermarket scanner. perform the same calculation for a 543.5-nm (green) helium-neon laser.

The kinetic energies are 0.46 eV and 0.78 eV.

Explanation:

Given that,

Work function = 1.5 eV

Wavelength = 632.8 nm

We need to calculate the energy for red helium neon laser

Using formula of energy

Put the value into the formula

We need to calculate the kinetic energy

Using formula of K.E

=work function

E = energy

Put the value into the formula

We need to calculate the energy for green helium neon laser

Using formula of energy

We need to calculate the kinetic energy

Using formula of K.E

Hence, The kinetic energies are 0.46 eV and 0.78 eV.

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