(Answered) Two musicians are playing the same instruments the first

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Two musicians are playing the same instruments. The first one emits the sound with correct wavelength 58 cm while the second one is off, and the wavelength is 5 mm longer. a) What is the frequency of the beats when they play together? b) By how much does the second musician need to change her instrument's wavelength so that the frequency of the beats is reduced to 1 Hz?

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