Which of the following statements are true? a)all kinds of vibrations in the material bodies produce sensation of sound b)sound makes the eardrum vibrate c) sound can travel through vacuum d) ultrasonic vibrations have a range below 20Hz *
A)both a and c
B)both b and d
C)both a and b
D)both c and d
i need answer gays fast
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Answer:
a) both a and c
Explanation:
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