Atoms and Nucle...

The magnetic moment of the ground state of an atom whose open sub-shell is half-filled with five electrons is

Assuming f to be frequency of first line in Balmer series, the frequency of the immediate next (i.e. second) line is

Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be

If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li²⁺ is

Electrons in a certain energy level n = n₁, can emit 3 spectral lines. When they arc in another energy level, n = n₂ they can emit 6 spectral lines. The orbital speed of the electrons in the orbits are in the ratio

Three photons coming from excited atomic hydrogen sample are observed, their energies arc 12.1 eV, 10.2 eV and 1.9 eV. These photons must come from

The K_α line of singly ionised calcium has a wavelength of 393.3 nm as measured on earth. In the spectrum of one of the observed galaxies, the spectral line is located at 401.8 nm. The speed with which this galaxy is moving away from us, will be

The wavelength of the first spectral line of sodium is 5896 A. The first excitation potential of sodium atom will be (h = 6.63 × 10^-34 Js)

At the time of total solar eclipse, the spectrum of solar radiation will have