Frequently Asked Questions
How is photon energy related to wavelength?
Photon energy is inversely proportional to wavelength through the Planck-Einstein relation, so shorter wavelengths carry more energy. This is why ultraviolet light is more damaging than infrared light.
Why use electronvolts instead of joules?
Single-photon energies are extremely small in joules, so the numbers are awkward. Electronvolts give convenient values, typically a few electronvolts for visible light, which makes comparisons much easier.
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