Q79 of 123 Page 255

What is noise? Give two examples of sounds which are considered noise.

The Unwanted sound that is unpleasant to ear is called noise.

Example- 1) Loud music


2) The noise of machines.


More from this chapter

All 123 →
77

A pendulum oscillates 40 times in 4 seconds. Calculate its

(i) time-period, and


(ii) frequency.


Can we hear the sound produced by the oscillations of this pendulum? Give reason for your answer.

 78

Draw a neat and labelled diagram of the human ear. Explain its working.

 79

What is a musical sound ? Give two examples of musical sounds.

 80

What is meant by noise pollution? Mention some of the sources of noise pollution in your surroundings.