The energy of a hydrogen atom in its ground state is $-13.6 \,eV$. The energy of the level corresponding to $n=7$ is ...... $eV$.

$A$ hydrogen atom absorbs radiation of wavelength $975 \, \text{\AA}$ to transition from the ground state to an excited state. To which energy level will the atom transition?

The potential energy of the orbital electron in the ground state of a hydrogen atom is $-E$. What is its kinetic energy?

The energy required to knock out the electron in the third orbit of a hydrogen atom is equal to

When a hydrogen atom is raised from the ground state to the excited state,

Let $T_{1}$ and $T_{2}$ be the energy of an electron in the first and second excited states of a hydrogen atom,respectively. According to the Bohr's model of an atom,the ratio $T_{1}: T_{2}$ is