Which wave property determines the loudness of sound?

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Frequency

Pitch

Speed

Amplitude

answer is D.

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Detailed Solution

The amplitude of the sound wave determines the loudness of the sound.
Sound is a vibration that travels as an acoustic wave through a transmission medium like a gas, liquid, or solid. The amplitude of the sound wave is a factor that determines how loud a sound is. If the sound wave's amplitude is high enough, the sound is considered loud.
However, it's important to note that the relationship between amplitude and loudness is not linear. As the amplitude of a sound wave doubles, the perceived loudness does not double. Instead, a doubling of amplitude typically results in an increase of about 10 decibels (dB), which is roughly perceived as a doubling in loudness.

Decibels serve as a measurement of sound volume. The square of the vibration's amplitude is directly related to loudness (dB).

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