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How many beats will be heard if two identical flutes, each 0.66 mm long, try to...

How many beats will be heard if two identical flutes, each 0.66 mm long, try to play middle C (262 HzHz), but one is at 7.0 ∘C∘C and the other at 20 ∘C∘C?

Express your answer using two significant figures.
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