Assertion (A) : The speed of ultrasound waves is higher than supersonic waves.

Reason (R) : Supersonic is used for objects travelling with speed greater than speed of sound in air.

1. both A and R are true and R is the correct explanation of A
2. both A and R are true and R is not the correct explanation of A
3. assertion is false but reason is true
4. assertion is true but reason is false

What do you mean by the audible range of frequency?

For which range of frequencies are the human ears most sensitive?

Which has a higher frequency — ultrasonic sound or infrasonic sound?