Waves and Sounds

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The Speed of Sound: Dropping a Coin


You are standing near the edge of a wishing well, gazing downwards. There is water at the bottom but you are unsure how deep the well is. Luckily, physics can help you find out. You close your eyes, make a wish, and toss a coin into the well. (Neglect air resistance and assume the speed of sound to be 340 m/s).