PhysicsChapter 11: Electromagnetic Waves
The Photon Model of Light
Introduction
Electromagnetic radiation can be described using a photon model. A photon is a quantum of electromagnetic radiation. The energy of a photon is: E = hf where: `E` = photon energy `h` = Planck's constant `f` = frequency
Definition
Frequency and Energy
Higher frequency means greater photon energy. Therefore: Gamma-ray photons have much more energy than radio-wave photons.
Photon Momentum
Photons also carry momentum: **p = hλ** where: `p` = photon momentum `λ` = wavelength
Wave-Particle Idea
Electromagnetic radiation shows both wave-like and particle-like behaviour. The wave model explains phenomena such as diffraction and interference. The photon model is useful for explaining energy transfer in interactions with matter.
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Review the key facts, formulas and checks before you move on.The Photon Model of Light
Sticky Notes · Quick Revision
PHOTON
- Energy = hf
Momentum
- hλ
60-second revision
- Photon → quantum of EM radiation.
- **E=hf**
- Higher frequency → higher photon energy.
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