What do you mean by the audible range of frequency?

What is the audible range of frequency for humans?

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

Complete the following sentences —

(a) An average person can hear sounds of frequencies in the range ………. to ……….

(b) Ultrasound is of frequency ……….

(c) Infrasonic sound is of frequency ……….

(d) Bats can produce and hear ………. sound.

(e) Elephants produce ………. sound.