8 | P a g e
( 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