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Sound waves of frequency below 20 Hz, which the human ear cannot hear, are called
Aaudible waves
Bultrasonic waves
Cinfrasonic waves
Dsupersonic waves
Answer & Solution
Correct answer: C. infrasonic waves
1. The audible band lies between 20 Hz and 20000 Hz.
2. Frequencies below 20 Hz fall under infrasonic waves, which we cannot hear.
3. Ultrasonic waves are above 20000 Hz, so that option is wrong.
4. Earthquakes and ocean waves are examples of infrasonic sources.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.67_
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