Continuous emission spectrum is produced by

The spectrum of iodine gas under white light will be:

In the absorption spectrum of $Na$,the missing wavelength$(s)$ are:

Band spectrum is produced by

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

$A$ particular hydrogen-like atom has its ground state binding energy $122.4 \ eV$. It is in the ground state. Then: