What isthe range of frequencies associated with
(a) Infrasound?
(b) Ultrasound?
(a) Infrasoundhas frequencies less than 20 Hz.
(b) Ultrasoundhas frequencies more than 20,000 Hz.
Complete the following sentences :
(a) An average person can hear sound 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.