Sound is produced by Vibrations
Sound is produced by Vibrations
We hear sound from various sources, e.g. from humans, birds, machines, vehicles, TV, radio, etc. Sound is a form of energy which produces a sensation of hearing in our ears.
Production of sound: A sound is produced by vibrating objects. Vibration means a kind of rapid to and fro motion of an object. The sound of human voice is produced due to ‘vibrations in the vocal cords. We can produce sound by striking the tuning fork, by plucking, scratching, rubbing, blowing or shaking different objects. They all produce sound due to vibrations.
A tuninng fork is used to produce a specific type of sound. It is a U - shaped steel device with a stem at the base. The tunning fork is held by the stem and one of its pong is struck against a rubber pad. This causes the prongs to start vibrating, which produce a sound. Although the sound is clearly heard, it is not easy to see the vibrations of the prongs. However, you can confirm that the prongs are vibrating by doing the following activity.
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A TUNNING FORK
Activity:
Gently touch the surface of the water kept in a vessel with a prong of a tunning fork, after striking it against a pad. Since the prong vibrates, it creates ripples in water.
We can now say that sound is produced by a vibrating body.In other words, the source of sound is a vibrating body.
In ordinary talk, the amplitude of vibration is aproximately | |||
| Right Option : C | |||
| View Explanation | |||
A vibrating body : | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following statements are correct ? (i) Sound is produce by vibrations. (ii) Sound reqires a medium for propagation. (iii) Light and sound both require a medium for propagation. (iv) Sound travels slower than light. | |||
| Right Option : D | |||
| View Explanation | |||
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