Complete the following sentence :
The sound is produced by a ___ body.
The sound is produced by a vibrating body.
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.
Complete the following sentences:
(a) The kinetic energy of a body is the energy by virtue of its..........................
(b) The potential energy of a body is the energy by virtue of its..........................
(a) The pitch of sound increases if its frequency ......................................
(b) If the amplitude of a sound is halved, its loudness becomes ......................