Sound is produced by Vibrations


 
 
Concept Explanation
 

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.

                                                   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. 

Sample Questions
(More Questions for each concept available in Login)
Question : 1

Assetion (A) : Different musical sounds are produced from percussion instruments by exciting the stretched membrane at different tensions.

Reason (R) : Flute, bassoon, oboes are example of drum instruments.

Right Option : C
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Explanation
Question : 2

Arrange the following steps of an experiment in a sequential order to deterine the frequency of a simple pendulum.

  • (A) Start the stop watch when the job reaches the exterme position and count the number of oscillations.
  • (B) Suspend a simple pendulum from a cork fixed to a stand.
  • (C) Repeat the experiment and determine the time taken for 20 oscillations. (t_2)
  • (D) Pull the job of the simple pendulum from its initial position of rest and release.
  • (E) Stop the stop watch at the end of 20 oscillations and determine the time taken to complete 20 oscillations (t_1)
  • (F) Determine the average of t_1 and t_2 as t.
  • (G) The time period of the oscillation is found using. T =frac{t}{20}, , and, , frequency, , , using,, , f=frac{1}{T}.
Right Option : C
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Explanation
Question : 3

The maximum possible displacement of a vibrating body from its mean position during its motion is equal to ____________

Right Option : B
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Explanation
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