Moseley observed that the plot of √𝑣 against atomic number (𝑍) gave a straigth line. What does 𝑣 indicate here?

Explanation

In 1913, Henry Moseley discovered a systematic relationship between the frequencies of X-rays emitted by elements and their atomic numbers, establishing Moseley's Law. This historically proved that the atomic number is a genuine physical property linked to nuclear charge, leading to the definitive reorganization of the periodic table.