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Ah help! What formula do you use, and show how you get the answer?

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A boat is moving towards a lighthouse with a speed of 15 m/s as the foghorn blows with a frequency of 180 Hz. What frequency does the boat captain hear as he moves? Assume the speed of sound is 345 m/s. Show the work please!

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  1. f = fs(u + v)/u = 180*(345 + 15)/345 = 180*1.043 = 187.8 Hz

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