Question

Calculate the frequency of a vibrating body if it vibrates 400 times in 20 seconds. Identify the category of sound it belongs to.(sonic sound/ ultrasound/ infra sound)
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Answer 1

Answer:

The frequency will be 20Hz, sonic sound

Explanation:

As:-

Amount of time:- 20sec

Number of vibrations in the given time:-400

Now frequency in the number of oscillations in a second so

Number of vibrations in a second= 400/20

                                                       =20

Frequncy=20Hz

• Sonic sound is from 20Hz-20,000Hz
• Ultrasound is above 20,000 Hz
• Infrasound is below 20Hz

-So it will be sonic sound