Vibrational energy is

The wavelength and frequency of a photon with energy $2 \ eV$ are respectively:

In Bohr's model,the atomic radius of the first orbit is $\gamma$. The radius of the $3^{rd}$ orbit is:

In a hydrogen atom,if an electron transitions from an $n$-th orbit to the ground state,and the total number of spectral lines observed is $10$,then the value of $n$ is:

When an electron jumps from $L$ to $K$ shell,what happens to the energy?

The masses of photons corresponding to the first lines of Lyman and Balmer series of the spectrum of hydrogen atom are in the ratio of