One tuning fork vibrates at 440 Hz, and a second tuning fork vibrates at an unknown frequency. When the two forks are struck at the same time, beats with a frequency of 3 Hz are heard. (a) What is the frequency of the second tuning fork? Why are there two possible answers? (b) Describe an experiment you could perform with a small piece of wax to determine which of the possible answers in part (a) is correct.
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