When two different materials A and B having atomic number $Z_{1}$ and $Z_{2}$ are used as the target in Coolidge $γ$ -ray tube at different operating voltage $V_{1}$ and $V_{2}$ respectively their spectrums are found as below.

The correct relation is

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λ m i n = h c e V ⇒ λ ∝ 1 V ∵ λ 2 > λ 1 (see graph) ⇒ V 1 > V 2 f = a Z - b Moseley's law f ∝ Z - 1 2 ⇒ λ ∝ 1 Z - 1 2 ( ∵ f ∝ 1 λ ) λ 1 > λ 2 (see graph for characteristic lines) ⇒ Z 2 > Z 1

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