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

The nature of the sun's spectrum is

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

The crystal structure of $NaCl$ is:

The emission spectrum of $CO_2$ gas is:

An electron collides with an atom in its ground state. The atom then emits a photon of energy $E_{photon}$. In this process,the change $\Delta E_{elec}$ in the electron's energy is