The ratio of ionization energy of Bohr's hydrogen atom and Bohr's hydrogen like lithium atom is
$1 : 1$
$1 : 3$
$1 : 9$
None of these
The ratio between total acceleration of the electron in singly ionized helium atom and hydrogen atom (both in ground state) is
State the dimension of the nucleus from Rutherford experiment.
The diagram below shows the lowest four energy levels for an electron in a hypothetical atom.The electron is excited to the $-1\,eV$ level of the atom and transitions to the lowest energy state by emitting only two photons. Which of the following energies could not belong to either of the photons ? .....$eV$
The figure represents the observed intensity of $X-$rays emitted by an $X-$ray tube, as a function of wavelength. The sharp peaks $A$ and $B$ denote
The ratio of the speed of the electrons in the ground state of hydrogen to the speed of light in vacuum is