1.

Mosley's law for characteristic X-rays 1/lambda=R (z-b)^(2) (1/n_(1)^(2)-1/n_(2)^(2)) is Which of the following statements is/are correct?

Answer»

It is applicable to all those atoms to which Bohr's theory is not applicable.
It is applicable to all ENERGY levels of some atoms only
It cannot be applied for HIGHER values of `n_(1) and n_(2)`
It cannot be applied to higher values of Z.

Solution :Mosely.s law is applicable to characteristic X-rays only. It is applicable only for those transisition of ATOM during which an X-ray photon is emitted. Therefore, it cannot be applied to all the transition in an atom.
For higher values of `n_(1) and n_(2)` difference in their energy levels is small. Therefore, emitted photons will not corresponds to X-rays. Therefore, Moseley.s law cannot be applied to such transitions, also SINCE characteristic X-rays are emitted for CERTAIN transititions in atom having large Z, it become applicable to such transitions.


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