`Statement - 1:` When white light (which contains all wavelengths) is passed through atomic hydrogen gas then transmitted beam is not having some wavelengths whose photons energy is equal to difference of two energy levels.This is due to absorbtion of photon by atom.The resulting excited atom then re-radiate photons in random direction with only a few in the same direction as of original beam of white light. ` Statement - 2:` Momentum remains conserved during absorption or emission of photon by atomic hydrogen

For light of a wavelength 4000 Å, the photon energy is 2eV. For X rays of wavelength 1 Å, the photon energy will be

A hydrogen atom initially in the ground level absorbs a photon and is excited to n=4 level then the wavelength of photon is

Calculate the energy of one of the photons of a beam of light having wavelength 25.0 mu m.

A hydrogen like atom in ground st6ate abserbs n photon having the same energy and its emit exacity n photon when electron transition tekes placed .Then the energy of the absorbed photon may be

A parallel beam, of light of wavelength 100 nm passed through a sample of atomic hydrogen gas in ground state. (a) Assume that when a phton supplies some of its energy to a hydrogen atom, the rest of the energy appears an another photon moving in the same direction as the incident photon. Neglecting the light emitted by the excited hydrogen atoms in the direction of the incident beam, what wavelengths may be observed in the transmitted beam? (b) A radition detector is placed near the gas to detect radiation coming perpendicular to the incident beam. Find the wavelength of radiation that may be detected by the detector.

A photon beam of energy 12.1eV is incident on a hydrogen atom. The orbit to which electron of H-atom be excited is