Question

What is the momentum of an electron of energy 100 eV?

Answer 1

For a photon,

Energy = Momentum / Speed of light
Momentum = Energy * c
= 110 electron volts * 3*10^8 m/s
= 110*1.6*10^-19 Joules * 3*10^8 m/s

The momentum can further be calculated.

Answer 2

Answer:

Explanation:

An electron is a negatively charged subatomic particle that can be either free which means not attached to any atom or bound to the nucleus of an atom. Electrons in the atoms exist in spherical shells of various radii, that represent the energy levels.

E = 100 eV

= 100 × 1.602 × 10^{-19} J

= 1.602 × 10^{-17} J

lambda = h/ √(2mE)

= 6.626 × 10^{-34} / √(2 × 9.1 × 10^{-31} × 1.602 × 10^{-17})

= 1.227 × 10^{-10} m

Therefore,  the momentum of an electron of energy 100 eV is  1.227 × 10^{-10} m.