What is the speed of a photon with respect to another photon if (a) the two photons are going in the same direction and (b) they are going in opposite directions?

Two photons having

When a photon stimulates the emission of another photon the two photon have

What is the energy of a photon of wavelength 6000Å

What is the energy of a photon whose wavelength is 6840 Å ?

Write two different vectors having the same direction.

What is a photon?

A parallel beam of light of wavelength 100 nm passes through a sample of atomic hydrogengas in ground state (a)Assume that when a photon suppose some of its energy to a hydrogen atom the rest of the energy appears as another photon moving in the same direction as the incident photon Neglecting the light emitted by the excited hydrogen ato in the direction of the incident beam, ? (b) A radiation detector is placed near the gas to detect radiation coming perpenducular to the incident beam find the wevelength of radiation that may be detected by the detector

Relative velocity of A with respect to B when A and B are in the opposite direction is :

Do compressions and rarefactions in sound wave travel in same directions or in opposite directions ? Explain.