Question

The amplitude of a compressional wave depends on the _____.

A.) density of material in compressions and rarefactions
B.) distance between crests and troughs
C.) number of wavelengths that pass by a point each second
D.) vibration of electric and magnetic parts

Answer 1

Volume of a sound wave  which is a type of compressional wave  is the description of amplitude. The amplitude is a measure in the intensity of the waves, or the amount of variation in air pressure. Our perception of pitch varies with the frequency, or how frequently the alternations in air pressure persist. The answer is A.