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← Physics Basics
Part 1 · Basic Physics Principles
Question 1 of 5
Sound is classified as ultrasound when its frequency is above which value?
A.
20,000 Hz (20 kHz)
B.
20 Hz
C.
2,000 Hz (2 kHz)
D.
2,000,000 Hz (2 MHz)
Select an answer to see the explanation.