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(a) What is the difference between infrasonic waves and ultrasonic waves?
(b) Choose the infrasonic waves and ultrasonic waves from the following frequencies: (i) 10,000 Hz (ii) 30,000 Hz (iii) 18 Hz (iv) 50,000 Hz (v) 10 Hz
(a). Difference between infrasonic waves and ultrasonic waves:
| Infrasonic waves | Ultrasonic waves |
| The sound waves having frequencies lower than the audible range are known as Infrasonic waves. | The sound waves having frequencies higher than the human audible range are known as ultrasonic waves. |
| Elephants and whales can use and hear infrasonic sound waves. | In the medical field, ultrasonic sound waves are used for imaging internal organs. |
| Infrasonic waves have frequencies lower than $20\ Hz$. | Ultrasonic waves have frequencies higher than $20,000\ Hz$. |
(b). Infrasonic waves: Frequencies $18\ Hz$ and $10\ Hz$ belong to infrasonic waves.
Ultrasonic waves: Frequencies $30,000\ Hz$ and $50,000\ Hz$ belong to ultrasonic waves.
Updated on: 10-Oct-2022
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