Two strings both vibrate at exactly 819 hz. the tension in one of them is then increased slightly. as a result, six beats per second are heard when both strings vibrate. what is the new frequency of the string that was tightened?

Explanation:

The beat frequency between 2 frequencies and is given by the formula . Since increasing the tension of a string means higher frequency, we will assume we did this with the string vibrating at , so we can write because , which means , and for our values this is:

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12000j is work done