Physics
Photon Emission
Quick fact
A single excited electron can emit a photon with energy precisely matching the difference between two atomic energy levels.
Why this is interesting
Have you ever wondered how light bulbs glow or why stars shine? It all starts with a single atom releasing energy in the form of a tiny packet of light called a photon.
Read the full explanation
Understanding Photon Emission
When an atom absorbs energy, its electrons jump to higher energy states. When they fall back to lower states, they release that extra energy as photons—tiny packets of light. This process is fundamental to how light and heat are produced in everyday life.
A deeper explanation
Photon emission occurs when an electron transitions from a high-energy state to a lower one within an atom. The difference in energy between these two levels determines the wavelength (and thus color) of the emitted photon. This principle explains everything from glowing neon signs to the light from distant stars, and it's central to quantum mechanics.