Answers

2015-05-13T16:10:47+05:30
(a) The sound having frequencies bellow 20 Hz are called infrasonic sound.
(b) The sound having frequencies above 20,000 Hz or 20 kHz are called ultrasonic sound.
0
2015-05-13T16:56:48+05:30
Sounds waves of frequencies below 20hz are infrasonic waves. Those above 20000 hz are called ultrasonic waves
0