If the radius of the first Bohr orbit of hydrogen is $r_1$, what is the radius of the third Bohr orbit of $Li^{2+}$?

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is

The energy required to excite an electron in a hydrogen atom from n=1 to n=2 is:

In hydrogen atom, the electron is moving round the nucleus with velocity $2.18 imes {10^6}\;{\rm{m}}{{\rm{s}}^{ - 1}}$ in an orbit of radius $0.528\;{A^0}$. The acceleration of the electron is

The spectral series of the hydrogen atom that lies in the visible region of the electromagnetic spectrum

Which of the following transitions in a hydrogen atom would emit a photon with the shortest wavelength?

The Balmer series in the hydrogen spectrum corresponds to electron transitions ending at which energy level (n)?

The energy of a hydrogen atom in its ground state is $- 13.6\,\,eV$. The energy of the level corresponding to the quantum number $n = 2$ (first excited state) in the hydrogen atom is

For hydrogen atom, the ratio of wavelength of last line of Balmer series to the wavelength of last line of Lyman series is

If an atom loses an electron, what happens to its overall charge and its emitted spectrum?

(A) It becomes negatively charged and the spectrum remains the same.

(B) It becomes positively charged and the spectrum changes.

(C) It becomes positively charged and the spectrum remains the same.

(D) It becomes negatively charged and the spectrum changes.

The wavelength of Lyman series is