The spectrum of iodine gas under white light will be:

The band spectra (characteristic of molecular species) is due to emission of radiation from which state of matter?

The colour of the positive column in a gas discharge tube depends on

If the ionisation potential of a helium atom is $24.6 \, V$,the energy required to ionise it will be

An energy of $24.6\ eV$ is required to remove one of the electrons from a neutral helium atom. The energy (in $eV$) required to remove both the electrons from a neutral helium atom is

$A$ stationary hydrogen atom emits a photon corresponding to the first line of the Lyman series. The recoil velocity of the atom is nearly (in $m/s$)