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# Waves and Acoustics: Creating a Metronome

WAVES-1SBZCH

Harold needs to practice his violin but does not have a metronome to keep him in time. He does, however, have two sound generators that can each produce a pure tone of whatever frequency he sets it to.

Which set of frequencies would produce a beat frequency in the range of allegro moderato (116-120 beats per minute) and help Harold practice?

A

${f}_{1}=998Hz$
${f}_{2}=1002Hz$

B

${f}_{1}=332Hz$
${f}_{2}=450Hz$

C

${f}_{1}=714Hz$
${f}_{2}=712Hz$

D

${f}_{1}=820Hz$
${f}_{2}=700Hz$