Electron Transitions – Practice


1) Determine the energy of a photon of red light with a wavelength of 700nm.

2) How much energy must an electron absorb to move from the first excited state to the third excited state?

3) An electron emits a photon with an energy of 1.94 x 10-18 J as it transitions to the ground state,
determine from which level the electron fallen.

Quick Answers:

1) 2.84 x 10-19 J (video incorrectly states 2.84 x 10-17 J)

2) 4.09 x 10-19 J

3) The third energy level (n=3)

Worked Answers: