Sound energy and loudness are functions of wave amplifiers increase sound energy and decibel level or loudness so sounds can be heard at greater distances. a) amplitude b) rarefaction c) speed d) wavelength

I think it would be amplitude.

The correct answer is Option A.

Explanation:

For the given options:

Option A: Amplitude of a wave is defined as the maximum distance from its mean position. It tells us about the loudness of the wave and also the sound energy.

Option B: Rarefaction is defined as the region which is low in density.

Option C: Speed of the wave is defined as product of the wave's frequency and wavelength.

Option D: Wavelength is defined as the distance between two crests or two troughs.

Hence, the correct answer is Option A.

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