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( ii) L – series When electrons of higher orbit( n = 3, 4, 5, …) jump to second orbit( n = 2), then L-series of X-rays are produced.
( iii) M – series When electrons of higher orbit( n = 4,5,6, …) jump to third orbit( n = 3), then M-series of X-rays are produced.
First lines of these series are called K α, L α, M α. Second lines of these series are called K β, L β, M β
Moseley’ s Law
The frequency of X-ray is given by V = a( Z – b) 2 where a and b are constants and Z is atomic number of element. Frequency of X-rays v ∝ Z 2