Question

what is emitted when an electron drops from a higher energy state to a lower one? o sound waves o a proton o a photon of light o a neutron

Explanation:

When an electron drops from a higher - energy state to a lower one, it emits a photon of light. This is based on the principle of quantum mechanics where the energy difference between the two states is carried away by the photon. Neutrons and protons are sub - atomic particles in the nucleus and are not emitted in this process. Sound waves are mechanical waves and not related to this electronic transition.

Answer:

B. A photon of light