valuable points on sound
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The phenomenon which makes the sound of an approaching train shrillerDoppler effectSounds cannot travel in vacuumSounds travel faster in metals than in airSonic boom occurs when a super sonic aircraft crosses the sound barrier
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Key notes for Chapter - Sound, are:
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 vibrating object is first displaced from its equilibrium position. Each particle disturbs the other particle in contact. Thus, the disturbance is carried from the source to the listener.
Explanation:
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