📝 Multiple Choice Question
General-science
Ultrasonic waves are sound waves with frequencies of what range?
A
Below 20 Hz
B
Between 20 Hz and 20,000 Hz
C
Above 20,000 Hz
D
Equal to the speed of light
Explanation
Ultrasonic waves are high-frequency sound waves that exceed 20,000 Hz (20 kHz). They are beyond the upper limit of normal human hearing.
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