21. Which of the following statement is NOT TRUE about ultrasonic waves?
A. Used to help physicians see internal organs.
B. Used as insect extermination.
C. Monitor earthquakes.
D. Detect aircrafts and submarines.
A. Used to help physicians see internal organs.
B. Used as insect extermination.
C. Monitor earthquakes.
D. Detect aircrafts and submarines.
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C. Monitor earthquakes
Seismographs are instruments used to record the motion of the ground during an earthquake, not ultrasonic waves.