CLASS 5 NAITIK SHIKSHA LESSON 9 EXERCISE
CLASS 5 NAITIK SHIKSHA LESSON 9 EXERCISE
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class 3 s.st lesson 2 something to do
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SOUND Main topics covered in this part of CBSE Class 9 Science, Sound: Chapter Notes, are: Sound-Production and Propagation Medium Wave and its Types Characteristics of Sound Audible Frequency Reflection of Sound and its Laws Applications of Reflection of Sound Sound Sound is a form of energy which produces a sensation of hearing in our ears. Production of Sound Sound is produced due to the vibration of objects. Vibration is a periodic back-and-forth motion of the particles of an elastic body or mediumkind about a central position. It is also named as oscillation. For example: Stretched strings of a guitar vibrate to produce sound. When membrane of a table is struck, it vibrates to produce sound. Propagation of Sound The travelling of sound is called propagation of sound. Sound is propagated by the to and fro motion of particles of the medium. When an object vibrates, the particles around the medium vibrate. The particle in contact with the vi
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