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Prove that the sound is produced from a vibrating source.

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1. Attach a small piece of steel wire to one of the prongs of a tuning fork as shown in the figure. 

2. Strike the tuning fork with a rubber hammer. 

3. While it is vibrating, try to draw a straight line on a piece of smoked glass as quick as possible with, it. 

4. Keep the end of the wire in such a way just it touches the glass.

5. A line is formed in the form of a wave. 

6. Repeat the experiment when the tuning fork is not vibrating and observe the difference in the line. 

Observations: 

  1.  We have produced vibrations in the tuning fork by striking it with a hammer. 
  2.  Thus the vibrating tuning fork produces sound. 
  3.  Thus the sound is produced by vibrating bodies.

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