A beam of `13.0 eV` electrons is used to bombard gaseous hydrogen. The series obtained in emission spectra is // are

Options

A. Lyman series
B. Balmer series
C. Brackett series
D. All of these

Answer

D

Explanation

As the electron beam is having energy of `13 eV` , it can excite the atom to the states whose energy is less than or equal to `0.6 eV (13.6 - 13, E_(5) = 0.544 eV and E_(4) = 0.85 eV` . So , the electron beam can excite the hydrogen gas maximum to `4^(th)` energy state , hence the transit electron can come back to ground state from either of three excited states, thus emitting Lyman, Balmer and Paschen series.