The graph given below, shows the variation of $\sqrt{f}$ vs $z$ for characteristics X- rays. Lines 1,2,3 and 4 shown in the graph corresponds to any one of $K_{α}, K_{β}, L_{α}$ or $L_{β}$ emission, then $L_{β}$ is represented by ( $f$ = frequency, $z$ = Atomic number)

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For a given value of z , energy of K - series is more than L - series, also β - line has more energy as compared tc α - line.

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