60. The range of sound that can be detected by human ear
a. Infrasonic sound
b. Audible sound
c. Ultrasonic sound
d. all of the above
61. Sound wave within 32, 000 HZ to 62, 000 Hz can be used as rodent and insect exterminator causing disorientation and drives rodents and cockroaches is an
a. Infrasonic sound
b. Audible sound
c. Ultrasonic sound
d. all of the above
62. Sound waves are produced by
a. Radio station
b. vibrating objects
c. wave
d. none of the above​