Tuesday, 2 April 2013
Sound
Page 162
How does the sound
produced by a vibrating object in a medium reach your ear?
When an object vibrates, it
vibrates the neighbouring particles of the medium. These vibrating particles
then vibrate to the adjacent
particles In this way, vibrations
produced by an object are transferred from one particle to another till it
reaches to our ear.
Page 163
1 Explain how sound is produced by your school bell.
Ans: When the bell moves backwards, it creates a
region of low pressure know as rarefaction. As the bell continues to move
forward and backward, it creates a
series of compressions and rarefactions. This produce the sound of a bell
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