What is velocity of photon?

What is the velocity of sound in perfectly rigid rod ? Why ?

What is momentum of photon having frequency v?

What is energy of photon having frequency v?

What is the velocity of a small object that has separated from a rocket moving in free space with velocity 10km/s?

Photon of wavelength 4xx 10^(7) strikes on metal surface the work function of the metal being 2.13 eV Calculate (i) The energy of the photon ev (ii) The kinetic energy of the emission and (iii) the velocity of the photoelectron . (1 eV = 1.6020 xx 10^(19) J )

If average and instantaneous velocities are same, then what is the type of motion ?

Momentum of photon with frequency f will be …..(where c is velocity of light)

Photon of frequency v has a momentum associated with it. If c is the velocity of light, the momentum is:

Nomination of electron is 5200 A .At which velocity of electron its wavelength is equal to photon.

11xx10^(11) photons are incident on a surface in 100s.These photons correspond to a wavelength of 10Å .If the surface area of the given surface is 0.01 m^(2) ,the intensity of given radiations is ………(velocity of light is 3xx10^(8)ms^(-1),h=6.625x10^(-34)JS)