38. Sound waves with frequencies beyond 20,000 Hz are called
a. ultrasound.
b. infrasound.
c. sonar.
d. echolocation.
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38. Sound waves with frequencies beyond 20,000 Hz are called
a. ultrasound.
b. infrasound.
c. sonar.
d. echolocation.
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Answer:
A po
Explanation:
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