The frequency of a source of sound is $120 H z$ . How many times does it vibrate in a minute ?

5200 times

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5800 times

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6000 times

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7200 times

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Solution

The correct option is D
7200 times
Frequency of the sound is the number of vibrations per second.
$F r e q u e n c y =$ $\frac{N o . o f v i b r a t i o n s}{T o t a l t i m e i n s e c o n d s}$

$N o . o f v i b r a t i o n s = (F r e q u e n c y)$ $\times (T o t a l t i m e i n s e c o n d s)$

Given,
Frequency of sound = $120 H z$
Total time = $1 m i n u t e$ $(1 m i n u t e = 60 s e c o n d s)$
No. of vibrations = $120 \times 60 = 7200$

The source vibrates 7200 times in a minute and produces a frequency of 120 Hz.

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