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11
Sound
This section explores the nature, production, propagation, and characteristics of sound as a form of energy.
11.1
Production Of Sound
Sound is produced by the vibration of objects, which can be observed and measured through specific experiments.
11.2
Propagation Of Sound
Sound propagates through solids, liquids, and gases as a mechanical wave generated by vibrating objects.
11.2.1
Sound Waves Are Longitudinal Waves
This section explains that sound travels as longitudinal waves through a medium, characterized by compressions and rarefactions of particles.
11.2.2
Characteristics Of A Sound Wave
This section explores the essential characteristics of sound waves, including frequency, amplitude, and speed, along with their significance.
11.2.3
Speed Of Sound In Different Media
The speed of sound varies in different media depending on their physical properties, primarily temperature.
11.3
Reflection Of Sound
This section covers the concept of sound reflection, focusing on how sound waves bounce off surfaces and the phenomena of echoes and reverberation.
11.3.1
Echo
This section introduces the concept of echoes, discussing how sound reflects off surfaces and the necessary conditions for a distinct echo to be heard.
11.3.2
Reverberation
Reverberation refers to the persistence of sound in a space due to repeated reflections from surfaces.
11.3.3
Uses Of Multiple Reflection Of Sound
Multiple reflection of sound has practical applications, including megaphones, stethoscopes, and echoes.
11.4
Range Of Hearing
The section discusses the audible range of sound for humans and other animals, defining infrasound and ultrasound, and their significance.
11.5
Applications Of Ultrasound
Ultrasounds are high-frequency sound waves widely utilized in medical and industrial fields for a variety of applications, including imaging and cleaning.