guitarist compares the sound of her A-string with that of a properly tuned guitar with A = 110 Hz and notices that her note is flat (lower pitch). When the two notes are played at the same time she hears two loud-soft-loud beats per second. What is the frequency of her A string

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A guitarist compares the sound of her A-string with that of a properly tuned guitar with A = 110 Hz and notices that her note is flat (lower pitch). When the two notes are played at the same time she hears two loud-soft-loud beats per second. What is the frequency of her A string?

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