In the Bohr model, what phenomenon accompanies transitions between energy levels?

In the Bohr model, what phenomenon accompanies transitions between energy levels?

• A. Emission or absorption of a photon.
• B. Disappearance of subatomic particles.
• C. Continuous energy spectrum without discrete levels.
• D. Nuclear fusion events.

Answer: (A)

In the Bohr model, energy levels are quantized, and when an electron moves between these levels, energy is exchanged in discrete packets called photons. If it drops from a higher to a lower level, it emits a photon whose energy equals the difference between the levels. If it moves to a higher level, it must absorb a photon with that exact energy. This is why transitions produce specific lines in the spectrum rather than a continuous glow. Other phenomena listed don’t match what happens with electronic transitions: particles don’t disappear, a continuous spectrum would come from non-quantized energy, and nuclear fusion is a nuclear process unrelated to electron energy level changes.

In the Bohr model, energy levels are quantized, and when an electron moves between these levels, energy is exchanged in discrete packets called photons. If it drops from a higher to a lower level, it emits a photon whose energy equals the difference between the levels. If it moves to a higher level, it must absorb a photon with that exact energy. This is why transitions produce specific lines in the spectrum rather than a continuous glow.

Other phenomena listed don’t match what happens with electronic transitions: particles don’t disappear, a continuous spectrum would come from non-quantized energy, and nuclear fusion is a nuclear process unrelated to electron energy level changes.