An electron and a photon both have energy of 400 ev. Which has greater wavelength?

An electron and a photon each have a wavelength of 1.00 nm. Find the energy of the photon?

An electron and a photon each have a wavelength of 1.00 nm. Find the kinetic energy of electron.

An electron and a photon each have a wavelength of 1.00 nm. Find their momenta?

An electron and a proton have equal momentum. Which has more kinetic energy and what is the ratio between the kinetic energy of electron and proton?

The kinetic energy of an electrons is equal to the energy of photons. Show that de-Broglie wavelength of this electrons is less than the wavelength associated with a photon.