Question

Sound with frequency above 20,000 Hz is called ultrasonics.

• A. True
• B. False

Answer 1

The correct option is A True

1. Frequency is defined as the number of vibrations completed in one second.
2. The S.I. units of frequency are hertz (Hz).
3. Humans can hear the sounds only in the range of 20 Hz-20,000 Hz known as the audible range.
4. Frequencies greater than 20,000 Hz are called ultrasonics or supersonics which are used in Sonars.
5. Humans can't hear the ultrasonic sounds but bats, dogs, dolphins, etc. can produce and hear ultrasonic sounds.
6. Therefore, the given statement is true.