Final answer:
The wavelength of an EM wave determines its energy content.
Explanation:
When discussing the energy of an electromagnetic (EM) wave, the property that identifies if the wave has more or less energy is its wavelength. Longer wavelengths correspond to waves with less energy, while shorter, tighter waves carry the most energy. This relationship can be understood by the analogy of a person moving a heavy rope; more effort is needed to create short, tight waves than long, wide waves.
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