Physics
Photon Absorption in Atoms
Quick fact
Atoms only absorb photons that match the energy difference between their electron levels, which is why we see distinct colors in flames or neon signs.
Why this is interesting
Have you ever wondered why leaves glow when exposed to sunlight? It’s all about how atoms absorb light at specific energies.
Read the full explanation
Understanding Photon Absorption in Atoms
When a photon hits an atom, it can be absorbed if its energy matches the gap between two electron energy levels. This moves an electron to a higher energy state, called an excited state. The atom then releases this energy later as light, sound, or heat, depending on how it relaxes back.
A deeper explanation
Photon absorption occurs when the energy of the incoming photon exactly matches the energy difference between two quantum states in an atom. This allows electrons to jump to a higher energy level, which is unstable. Eventually, they drop back down, releasing energy as light or other forms. This principle explains how plants use sunlight for photosynthesis and how fluorescent materials glow.