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An "f" tuning fork with a frequency of 349 hz is used to test the "f" note of a piano. three beats are heard. this means the piano key is _____. in tune out of tune and has a frequency of 352 hz out of tune and has a frequency of 346 hz out of tune and has a frequency of either 346 or 352 hz

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out of tune and has a frequency of either 346 or 352 hz

The beat frequency is the sum and difference of the two frequencies. 

Answer:

option D

Explanation:

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