The wavelength of the energy emitted when electron comes from fourth orbit to second orbit in hydrogen is $20.397\,\,cm$. The wavelength of energy for the same transition in $H{e^ + }$ is

The wavelength of radiation emitted is ${\lambda _0}$ when an electron jumps from the third to second orbit of hydrogen atom. For the electron jump from fourth to the second orbit of the hydrogen atom, the wavelength of radiation emitted will be

Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spectral series which has an upper limit of wavelength equal to $18752\,\,{A^0}$ is

(Rydberg constant $R = 1.097\,\, imes \,\,{10^7}per\,{\rm{ }}metre$

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

Which of the following statements is true about the emission spectrum of hydrogen?

In Bohr’s model, if the atomic radius of the first orbit is ${r_0}$, then the radius of the fourth orbit is

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

The kinetic energy of electron in the first Bohr orbit of the hydrogen atom is

Gases begin to conduct electricity at low pressure because

If an atom were to lose an electron, what would be the resulting charge?

Which of the following is NOT a characteristic of line spectra of atoms?