On some days,air nearest the ground is colder than air that is higher up.On one of these days,sound waves
A) tend to be refracted upward.
B) tend to be refracted downward.
C) travel without refraction.
Correct Answer:
Verified
Q32: For AM radio,the A stands for
A)acceleration.
B)authorized.
C)amplitude.
D)agony.
E)almost.
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A)infrasonic
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