A C-130 Hercules is traveling toward a cliff

Mission highlight

A C-130 Hercules is traveling toward a cliff at the speed of 150 m/s. Its engines emit a tone at frequency f0. We consider that the speed of sound is 340 m/s. What frequency is received by a pilot after reflection from the cliff?

Image Source: U.S. Air Force
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The music of the icebergs.

iceberg_in_the_arctic_with_its_underside_exposedThe icebergs hiss and crackle as they drift toward the equator. Why?

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What are resonant modes?

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Why does inhaling helium make one’s voice sound funny?

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Does sound propagate further in cold weather, and if so, why?

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What causes the noise emitted from high-voltage power lines?

 


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Babbling Brook.

Why does the brook babbling / murmur ?

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