Final answer:
The true statement according to the quantum model of the atom is that when an electron drops down from a high energy level to a lower one, light energy is emitted. This emission occurs because electrons move in fixed energy levels around the nucleus, and they emit photons corresponding to the energy difference between the levels when they transition to a lower energy state.
Step-by-step explanation:
According to the quantum model of the atom, when an electron drops down from a high energy level to a lower one, light energy is emitted. This phenomenon can be represented by the Bohr model of the atom, which suggests that electrons move in orbits, or fixed energy levels, around the nucleus. The energy levels are quantized, meaning that electrons must gain or lose specific amounts of energy to transition between these levels. The electrons can absorb energy and jump to a higher energy level, termed as the excited state. However, they tend to return to the ground state by emitting energy in the form of photons, usually as visible light, which corresponds to the energy difference between the initial and final energy levels.