You leave the main stage and wander over to one of the tents, hoping for a bette

Question

You leave the main stage and wander over to one of the tents, hoping for a better experience. Inside the tent, you notice some thumping bass, but realize it sounds different from what you are used to. The artist has placed the subwoofer on a train that circles around the perimeter of the tent. You hear the sound coming from the subwoofer on the train and also the sound reflecting off the far side of the tent, creating a 1.5 Hz beat frequency. If the subwoofer is emitting at 43 Hz, how fast is the subwoofer on the train moving toward you? 3.

Explanation / Answer

Apply from Doppler effect

FL = Fs * (V + Vs)/(V-Vs)

V = 340 m/s

Vs = ?

Fl = 43-1.5 = 41.5

Fs 43 Hz

so

FL = fs *(V/V-Vs)

Vs = 331 *(1-43/41.5)

Vs = 12 m/s

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