Answered: In Equation 18.10, the beat equation… | bartleby

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In Equation 18.10, the beat equation (when adding two traveling waves of similar
frequencies) is
fi – f2
fi + f2
y = 2A cos 27
Cos 27
fi – f2
Here the amplitude envelop is dominated by cos 27
why is the beat
frequency frat = |fi - f2| and not divided by 2?

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