Wave Y and wave Z are two types of electromagnetic waves traveling through a vacuum. Suppose the frequency of wave Y is about three times greater than the frequency of wave Z.

The energy of an electromagnetic wave is proportional to its frequency: E = hf, where h is Planck’s constant. Since wave Y’s frequency is about three times wave Z’s, each photon of wave Y carries about three times as much energy. Therefore, choice C is correct: wave Y transfers about three times the amount of energy as wave Z.

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