Final answer:
Quantum mechanics is the study of energy levels in atoms, focusing on the motion of atomic or subatomic objects that exhibit wave-particle duality and gain or lose energy in small increments called quanta.
Step-by-step explanation:
The study of energy levels in atoms is called quantum mechanics. In classical mechanics, which is the study of the motion of large objects like baseballs, the quantum nature of tiny particles like electrons cannot be accurately described. Quantum mechanics specifically focuses on the motion of atomic or subatomic objects, which exhibit wave-particle duality. It explains how these particles gain or lose energy in small increments called quanta