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Question

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

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

(c) 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.

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Solution

(a) The time taken to complete one oscillation is called as time period. The unit is seconds.

(b) A vibrating object whose number of oscillations per second is known as its frequency. The unit of frequency of vibration or oscillation of a vibrating object is hertz. When an object makes one vibration per second its frequency is said to be 1 hertz. If an object makes 10 vibrations per second , then its frequency will be 10 hertz.

(c) Time period =Total timeNo of vibrations=440=0.1 s

frequency = 1T=10.1=10 Hz


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