The splitting of spectral lines under the influence of a magnetic field is known as .....

If the energies of two photons are in the ratio of $3:2$,their wavelengths will be in the ratio of

What changes are observed in the color of iron as it is heated,and how does the frequency of the emitted radiation change?

The energy of one mole of photons of radiation of wavelength $300 \ nm$ is ...... $kJ \ mol^{-1}$. (Given: $h = 6.63 \times 10^{-34} \ J \ s, N_A = 6.02 \times 10^{23} \ mol^{-1}, c = 3 \times 10^8 \ m \ s^{-1}$)

Which emission transition series is obtained when an electron jumps from $n_2 = \infty$ to $n_1 = 1$?

Consider two radiations of wavelengths $1. \lambda_1 = 2000 \mathring{A}$ and $2. \lambda_2 = 6000 \mathring{A}$. The ratio of the energies of these two radiations $\left(\frac{E_1}{E_2}\right)$ is . . . . . . (Nearest integer).