If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength $\lambda$. When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be:

Energy of electron in an orbit of $H$-atom is

According to Bohr’s theory, the moment of momentum of an electron revolving in second orbit of hydrogen atom will be

For principal quantum number $n = 3$, the possible values of orbital quantum number $'l'$ are

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is:

As the electron in Bohr orbit of Hydrogen atom passes from state $n = 2$ to $n = 1$, the kinetic energy $K$ and potential energy $U$ change as

Ionisation energy of an electron present in the second Bohr’s orbit of hydrogen is

The time of revolution of an electron around a nucleus of charge $Ze$ in ${n^{{\rm{th}}}}$ Bohr orbit is directly proportional to

For the Bohr’s second orbit of circumference $2\pi r$, the de-Broglie wavelength of revolving electron will be

The radius of the first (lowest) orbit of the hydrogen atom is ${a_0}$. The radius of the second (next higher) orbit will be

The radius of electron’s second stationary orbit in Bohr’s atom is $R$. The radius of the third orbit will be