The plot of square root of frequency of X-ray emitted against atomic number led to suggestion of which law/rule?

Consider the following statements I.Henry Moseley observed regularities in the characteristics of X ray spectra of elements II.A plot of frequency of X rays emitted against atomic number (Z) give a straight line III.The atomic number of element is equal to the number of neutron(s)in a neutral atom IV.Electron configuration of an atom determine the physical and chemical properties Choose the correct statement

Approximately linear relationship between the square roots of the frequencies of the X-rays emitted by a number of different elements and the atomic numbers was discovered by:

Find the maximum frequency, the X-ray emitted by an X-ray tube operating at 30 kV

Find the maximum frequency, the X-ray emitted by an X-ray tube operating at 30 kV

Find the maximum frequency, the X-ray emitted by an X-ray tube operating at 30 kV

Find the maximum frequency, the X-ray emitted by an X-ray tube operating at 30 kV

If gamma is the frequency of characteristic X-ray line emitted by a target element of atomic number Z, then Moseley's law is

The graph between the square root of the frequency of a specific line of characteristic spectrum of X - rays and the atomic number of the target will be