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Two tuning forks that have the same amplitude but slightly different frequencies are stuck at the...

Two tuning forks that have the same amplitude but slightly different frequencies are stuck at the same time to produce a complex wave. What is this called? If the period of the complex wave that they produce is 0.25s and the period of one of the tuning fork is 0.04s. What is one possible frequency of the other tuning fork? When the sinusoidal waves from the tuning fork are opposite phases, what happens at those points to the complex wave they produce?

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