Question 4
An object is vibrating at 50 Hertz. What is its time period?

(a) 0.02 s
(b) 2 s
(c) 0.2 s
(d) 20.0 s

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Solution

Time period $= \frac{1}{f r e q u e n c y}$
$T = \frac{1}{50} = 0.02 s$

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The sound from an insect is produced when it vibrates its wings at an average rate of 500 vibrations per second :

(a) What is the time-period of the vibrations?

(b) What is the frequency of the vibrations in hertz?

500

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