(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) 10 Hz

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Solution

(a) Difference between infrasonic and ultrasonic waves

Infrasonic waves Ultrasonic waves

These waves have frequencies below 20Hz. These waves have frequencies above 20 kHz.

They are produced by objects vibrating very slowly. They are produced by objects vibrating very rapidly.

(b)Among the following:
Infrasonic waves have frequencies of 10 Hz and 18 Hz.
Ultrasonic waves have frequencies of 30,000 Hz and 50,000 Hz.

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Infrasonic waves	Ultrasonic waves
These waves have frequencies below 20Hz.	These waves have frequencies above 20 kHz.
They are produced by objects vibrating very slowly.	They are produced by objects vibrating very rapidly.

(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) 10 Hz

(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) 10 Hz