The speed of sound in air increases with temperature. In the parlance of refraction, we can say the index of sound-in-air refraction decreases with temperature. During the day, the ground is heated by the sun and the air temperature is warmer near the ground (pinkish color) and cooler (bluish color) as you move away from the ground. During the night, just the reverse is true. There is a cooler layer of air near the ground with warmer air above it.
Would the residents of upper Contant be more likely to hear music coming from Lindberg beach during the day or during the night? As always, defend your answer.
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