Which of the following statement (s) is `//`are true?

Options

A. If H-atoms are in 3rd energy level then number of maximum different spectral lines produced by 2 atoms will be equal to number of maximum spectral lines produced by 3 H-atoms.
B. For third excited state, `He^(+)` ions and maximum number of different spectral line produced by 4 H-atoms are equal.
C. Energy evolved from 3rd to 2nd energy level transition in `He^(+)` can be used ot ionise `Li^(2+)` from ground level.
D. Energy evolved by a `He^(+)` ion which is in its 1st excited state can ionise a hydrogen atom which is in its ground state.

Answer

a,b,d