Which term describes the speed of a sound wave measured in hertz?

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The term that describes the speed of a sound wave measured in hertz is frequency. Frequency refers to the number of cycles of a wave that occur in a given period of time, typically measured in hertz (Hz), where one hertz is equal to one cycle per second. This measurement is crucial in understanding sound waves, as it determines the pitch of the sound heard. Higher frequencies correspond to higher pitches, while lower frequencies correspond to lower pitches.

In contrast, tone refers to the quality or character of a sound, which depends not just on frequency but also on factors like timbre. Amplitude measures the strength or intensity of a sound wave, which affects how loud the sound is perceived rather than its pitch. Decibel is a unit used to express the intensity of sound but does not relate directly to the frequency or speed of the sound wave itself. Thus, frequency is the term most accurately describing the characteristic of a sound wave connected to its speed measured in hertz.