This chapter highlights the unique functioning of our body and relates it with the form of energy. The science chapter 13 sound tells the students how the sounds are produced and reaches us by travelling through a medium. The students get to understand how our body responds to these sounds in several ways. Students grasp a bunch of new information about the variety of sources present in the world for sound production. In addition, students examine an astonishingly broad view of waves, vibration, and the path of propagation of these waves.
The lesson further discusses the two types of waves- longitudinal or transverse. Depending on the direction of the particle motion, one can easily differentiate between these two waves. Moreover, it tells about the necessary factors for a sound wave to propagate and external forces to carry these sound waves. Finally, the chapter elucidates vital information on how humans generate sounds through the larynx and various pitches produced by it. Students get to know about the frequency and pitch range differences in men and women.
The lesson generally serves to focus on giving a complete knowledge of the transverse section of the human ear divided into three parts-
1. Outer ear
2. Middle ear
3. Inner ear
It further elaborates that the interconnected functioning between these parts leads to the travelling of vibrations to the brain via auditory nerves. This text further discusses the properties of wave-like amplification, oscillation, time, and their relation to each other. Thus, it helps to focus on the basic concepts that result in the hearing sense of humans.
The chapter further teaches the characteristics of sound waves and the ranges of inaudible and audible sounds. These lead to a deeper understanding of the practical applications of these waves like sonar, dog whistle and echolocation. Students get their confusions clarified between loudness and pitch and the factors on which these depend. The chapter also makes the students aware of the preventive measures adopted to prevent noise pollution.