Can visible light be able to emit an electron bound in a metal having binding energy of 4eV?

What is the de-Broglie wavelength of an electron with kinetic energy of 120 eV?

What will be the wavelength of an electron of energy 500 eV?

What is the momentum and De Broglie wavelength of an electron with kinetic energy of 120 eV.

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

The wavelength of an electron of energy 120 k eV will be:

Visible light cannot eject photo electrons from copper metal, whose work function is 4.4 e V. Why? Prove it mathematically.