The plot of square root of frequency of X-ray emitted against atomi...

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The plot of square root of frequency of X-ray emitted against atomic number led to the
\( \mathrm{P} \) suggestion of which law/rule?
(MHT CET 2014)
(a) Periodic law
(b) Modern periodic law
W
(c) Hund's rule
(d) Newland's law
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