Q77 of 123 Page 255

Define 'frequency' of a vibrating object. Name the unit in which frequency is measured.

The frequency is described as the number of vibrations or oscillations per second. Its unit is Hertz (Hz)


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76

How can you show that sound cannot travel through a vacuum? Draw a labelled diagram of the apparatus used.

 77

What is meant by the 'time-period' of a vibrating object? State its unit.

 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.