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

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.

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

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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