The ratio between kinetic energy and the total energy of the electrons of a hydrogen atom according to Bohr's model is

The ratio of the energy of a photon of $2000 \ \mathring{A}$ wavelength radiation to that of $4000 \ \mathring{A}$ radiation is

For the $H$ atom,which of the following is the correct order of energy?

The energy of an electron in an excited hydrogen atom is $-3.4 \, eV$. According to Bohr's theory,the angular momentum of this electron in $J \cdot s$ is:

The ionization energy of a hydrogen atom is $13.6 \ eV$. The energy required to ionize a hydrogen atom in its second excited state is ........... $eV$.

In Bohr's atomic model,the radius $(r)$ and energy $(E)$ of an orbit $(n)$ are related as: