ASMO Science Olympiad 2018 — Level 3 (Years 7, 8 & 9) Question 18

Question 18

If an electron falls from the energy level of n =5 to the ground state of n = 1, what is most likely to occur?

1. A photon is absorbed.
2. The electron changes its spin direction.
3. A photon is emitted.
4. The electron gains velocity.
5. A neutron is transformed into a proton