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What is the Frequency?

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A friend of yours is loudly singing a single note at 400 Hz while racing toward you at 25.5 m/s on a day when the speed of sound is 340 m/s.

What frequency do you hear?

= (346/346-24.6) 380

= 346 x 380/ 321.4

= 409.085

= 409 hz

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