Rutherford created a theoretical picture of the atom based on :

Calculate the radius of the fourth orbit of the $B^{4+}$ ion. (in $pm$)

In which orbit of the Bohr model of the hydrogen atom is the speed of the electron maximum?

An electron initially present in an excited state of $H$ atom is further excited to another energy level by an incident photon. It releases $10$ photons while coming back to the ground state,out of which $7$ have higher energy than the incident photon. The electron was initially present in:

The electronic transitions from $n=2$ to $n=1$ will produce the shortest wavelength in which of the following species? (where $n$ is the principal quantum state)

If an electron falls from $n = 3$ to $n = 2$,then the emitted energy is $..........$ $eV$.