The energy required to remove the electron from a singly ionized Helium atom is 2.2 times the energy required to remove an electron from Helium atom. The total energy required to ionize the Helium atom completely is:

Among the following four spectral regions, the photons has the highest energy in

Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr’s atomic model

The energy of the highest energy photon of Balmer series of hydrogen spectrum is close to

The distance of closest approach of an $\alpha$-particle fired towards a nucleus with momentum $p$, is $r$. If the momentum of the $\alpha$-particle is $2p$, the corresponding distance of closest approach is

Which of the following is true for number of spectral lines in going from Lyman series to $P$-fund series

The ratio of speed of an electron in ground state in Bohrs first orbit of hydrogen atom to velocity of light in air is

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

Consider the following two statements ${\rm{A}}$ and ${\rm{B}}$ and identify the correct choice in the given answers

A: Line spectra is due to atoms in gaseous state

B: Band spectra is due to molecules

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 largest wavelength in the ultraviolet region of the hydrogen spectrum is ${\rm{122 }}\,{\rm{nm}}$. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer is)