Two piano strings are supposed to be vibrating at 132 Hz, buta piano tuner hears

Question

Two piano strings are supposed to be vibrating at 132 Hz, buta piano tuner hears three beats every 2 seconds when they areplayed together. (a) If one os vibrating at 132 Hz, what must bethe frequency of the other (is there only one answer)? I have no idea what a beat is. Please help! Two piano strings are supposed to be vibrating at 132 Hz, buta piano tuner hears three beats every 2 seconds when they areplayed together. (a) If one os vibrating at 132 Hz, what must bethe frequency of the other (is there only one answer)? I have no idea what a beat is. Please help!

Explanation / Answer

We know that beat frequency                 f2 - f1 = ± f                 f2 - 132 = ± (3 beats / 2s)             ==> f2 = 132 ± 1.5 = 130.5 Hz or 133.5Hz

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