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

During a total solar eclipse,the Fraunhofer lines become clearly visible because...

What is the total number of electron pairs in an oxygen molecule $(O_2)$?

The graph between the square root of the frequency of a specific line of characteristic spectrum of $X$-rays and the atomic number of the target will be

In a Franck-Hertz experiment,an electron of energy $5.6 \ eV$ passes through mercury vapour and emerges with an energy $0.7 \ eV$. The minimum wavelength of photons emitted by mercury atoms is close to ............. $nm$.

The splitting of a spectral line into groups under the effect of an electric or magnetic field is called: