Ultrasonic waves are those waves which ………
(a) human beings cannot hear
(b) human beings can hear
(c) have high velocity
(d) have large amplitude
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Ultrasonic waves are those waves which ………
(a) human beings cannot hear
(b) human beings can hear
(c) have high velocity
(d) have large amplitude
Ultrasonic waves are those waves which ………
(a) human beings cannot hear
(b) human beings can hear
(c) have high velocity
(d) have large amplitude
(a) human beings cannot hear