The rest mass of photon of wavelength `lambda` is

The momentum of a photon of wavelength lambda is

The mass of moving photon is

If V_1 and V_2 are stopping potentials for incident photons of wavelengths lambda_1 andlambda_2 for same cathode material, then Planck's constant is given by [e = charge on electron, c = speed of light]

In a biprism experiment , the distance between the first and eleventh bright fringes formed by light of wavelength lambda is 1.8 xx 10^-3 m .If the light is replaced by one of wavelength lambda/2 , find the distance between the first and sixteenth bright fringe .

When monochromatic light of wavelength lambda is incident on a metallic surface the stopping potential for photoelectric current is 3V_(0) when same surface is illuminated with light of waelength 2lambda the stopping potential is V_(0) The threshold wavelength for this surface when photoelectric effect takes place is

The de-Broglie wavelength lambda

When light of wavelength lambda is incident on photosensitive surface, the stopping potential is V. When light of wavelength 3lambda is incident on same surface, the stopping potential is V/6 Thereshould wave length for the surface is

There are materials which absorb photons of shorter wavelength and emit photons of longer wavelength. Can there be stable substances which absorb photons of larger wavelength and emit light of shorter wavelength

Momentum of a photon of wavelength 500overset@ A is…..