Physics
Photon Emission and Absorption
Quick fact
When an atom absorbs a photon, it jumps to a higher energy level. When it releases a photon, it drops back to a lower energy level.
Why this is interesting
Have you ever wondered why certain objects glow when heated, or how your phone charges using light? The answer lies in the interaction between atoms and light—specifically, photon emission and absorption.
Read the full explanation
Understanding Photon Emission and Absorption
Imagine an atom as a tiny ladder with rungs representing different energy levels. When light (photons) hits the atom, it can absorb energy and jump up a rung—this is absorption. To return to its original state, it releases a photon and drops back down—a process called emission.
A deeper explanation
Photon emission and absorption occur when an electron in an atom transitions between energy levels. Absorption happens when the atom gains energy from a photon, exciting the electron to a higher energy level. Emission occurs when the excited electron returns to its original state by releasing a photon. These processes are central to understanding how light interacts with matter at the atomic scale and underpin many natural phenomena and technological applications.