The emission spectrum of $CO_2$ gas is:

An electron of a stationary Hydrogen atom transitions from the fifth energy level to the ground level. The velocity that the atom acquires as a result of photon emission is ( $m=$ mass of the atom,$R=$ Rydberg's constant,$h=$ Planck's constant).

Band spectrum is obtained when the source emitting light is in the form of

When light emitted by a white hot solid is passed through a sodium flame,the spectrum of the emergent light will show

The wavelength of the emission line spectrum and the absorption line spectrum of a substance are related as:

$A$ neon sign does not produce