A piano tuner strikes a tuning fork at the same time he strikes a piano key with a note of a similar pitch. If he hears 3 beats per second, and the tuning fork produces a standard 440 Hz tone. Then what was the frequency produced by the struck piano string? a 434Hz or 446Hz b 437 Hz c 437Hz or 443 Hz d 443 Hz

Question

Priscilla Harrell

Physics

12 October, 10:51

A piano tuner strikes a tuning fork at the same time he strikes a piano key with a note of a similar pitch. If he hears 3 beats per second, and the tuning fork produces a standard 440 Hz tone. Then what was the frequency produced by the struck piano string? a 434Hz or 446Hz b 437 Hz c 437Hz or 443 Hz d 443 Hz

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Answers (1)

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Annika Dyer · Answer 1

The frequency produced by the string could be 437 Hz or it could be 443 Hz.

The frequency of the beats ... 3 Hz ... tells the piano tuner that

the difference between the fork and string frequencies is 3 Hz,

but it doesn't tell her which one is higher or lower.