A 12. 5 eV electron beam is used to bombard gaseous hydrogen at room temperature. The number of spectral lines emitted will be:
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According to Bohr's postulates, if an electron absorbs a photon with energy equal to the difference between the energies of an excited state and the ground state, it will jump to a higher energy orbital.
Considering that the energy of the colliding electron is 10. 2 eV or 12. 09 eV, depending on how much energy is lost during the collision, n = 3 is the maximum excited state. Hence, there are spectral lines in a total of
= 3
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