Science

Compressions and rarefactions

In this Class 9 Science topic from “Sound Waves: Characteristics and Applications,” students learn how sound travels through a medium as a longitudinal wave. They study compressions, where particles are crowded and pressure is high, and rarefactions, where particles are spread out and pressure is low. The topic explains how these alternating regions move through air or another medium, helping students understand sound propagation, wavelength, frequency, amplitude, and the connection between wave patterns and characteristics such as loudness and pitch.