3) The frequency of electron revolving in the n^th orbit of the H atom is proportional to:

4) Total number of radial nodes present in 5f orbitals will be:

5) The ionisation energy of H atom is 13.6 eV. The ionisation energy of Li⁺² ion will be:

6) In an X ray experiment, different metals are used as the target. In each case, the frequency ν of the radiation produced is measured. If Z = atomic number, which of the following plots be a straight line?

7) In Moseley′s equation, √ν = a(Z − b):