18. A piano tuner uses a tuning fork to adjust the key that plays the A note above middle C (whose frequency should be 440HZ). The tuning fork emits a perfect 440 Hz tone. When the tuning fork and the piano key are struck, beats of frequency 3 Hz are heard. (a) What is the frequency of the piano key? (b) If it's known that the piano key's frequency is too high, should the piano tuner tighten or loosen the wire inside the piano in order to tune it?
18. A piano tuner uses a tuning fork to adjust the key that plays the A note above middle C (whose frequency should be 440HZ). The tuning fork emits a perfect 440 Hz tone. When the tuning fork and the piano key are struck, beats of frequency 3 Hz are heard. (a) What is the frequency of the piano key? (b) If it's known that the piano key's frequency is too high, should the piano tuner tighten or loosen the wire inside the piano in order to tune it?
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Transcribed Image Text:18. A piano tuner uses a tuning fork to adjust the key that plays the A note above middle C
(whose frequency should be 440HZ). The tuning fork emits a perfect 440 Hz tone. When
the tuning fork and the piano key are struck, beats of frequency 3 Hz are heard.
(a) What is the frequency of the piano key?
(b) If it's known that the piano key's frequency is too high, should the piano tuner
tighten or loosen the wire inside the piano in order to tune it?
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