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Why do higher sound frequencies travel better at night?

Answer

Because at night the sun goes down, which is a good thing for frequencies, because the sun is giving of radiation which is disrupting the frequencies. so at night nothing is disrupting the frequencies.
Q&A Related to "Why do higher sound frequencies travel better..."
Sound travels farther at night because it tends to be quieter then & sounds
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The air cools and becomes more dense, which means the molecules that make it up are closer together. They transmit sound clearer and farther because of the increased density. Source
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One answer is the same distance it travels on a noisy night. The correct answer is that it probably travels forever but just gets weaker and eventually cannot be distinguished from
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