Find the nuclear screening constant for the L-series of X-rays if it is known that X-rays with a wavelength of λ = 1.43 are emitted when an electron in a tungsten atom(Z = 74) is transferred from the M-level to L-level. Take Rydberg constant = 10.97 × 106 m–1 .
When electron jumps from M to L-level, the first member of the L-series i.e. Lα line is given out. Its wavelength as given by Moseley’* law is
Substituting the given values, we have
