Which statement best describes the energy-wavelength relationship for electromagnetic radiation?

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The energy of a single quantum (photon) of light is tied to its frequency and inversely to its wavelength: E = h f = h c / λ. This means shorter wavelengths carry more energy per photon, while longer wavelengths carry less. For example, ultraviolet photons have higher energy than visible ones, which have higher energy than radio photons. Amplitude affects how many photons are present (and thus the overall intensity) but not the energy of each photon. So the correct description is that energy rises as wavelength shortens; energy falls as wavelength lengthens.