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ATO Electronic Warfare Practice Exam

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Planck's Law states that energy transfers associated with radiation are proportional to the what property of the radiation?
Correct Answer:
Frequency
Explanation:
Planck's law introduces the quantum idea that light energy comes in photons, and the energy of each photon is proportional to its frequency. Specifically, E = h f, so higher frequency photons carry more energy. Because energy transfer from radiation scales with the energy per photon, it is tied to frequency, not amplitude or phase. Wavelength is related to frequency by f = c/λ, so while you can express energy as E = h c / λ, the fundamental proportionality that governs energy transfer in Planck’s framework is with frequency.

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