What is a photon?

The de Broglie wavelength of an electron moving with a velocity of 1.5×10 8 m/s is equal to that of a photon. Find the ratio of the kinetic energy of the photon to that of the electron.

What is the velocity of a photon ?

Which one of the following is INCORRECT statements about a photon?

Calculate the energy associated with a photon of wavelength 4500 overset(@)(A) .

Calculate the energy associated with a photon of wavelength 4000 overset@ A

Do all the electrons that absorb a photon come out as photoelectrons?

What is kinetic mass of photon?

What is the momentum of a photon of frequency nu ?