Which one did Rutherford consider to be supported by the results of experiments in which $\alpha  – $ particles were scattered by gold foil?

The first line in the Lyman series has wavelength $\lambda $ . The wavlength of the first line in Balmer series is

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 ? …..$eV$

An alpha particle colliding with one of the electrons in a gold atom loses

Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is