Darth Maul and Obi Wan are playing their flutes $($which can be modeled as open$-$open tubes$),$ but the flutes are each at different temperatures. 

  

 How many beats will be heard if Darth Maul and Obi Wan both play middle C $(262$ Hz$)$ on their otherwise identical flutes, except that Darth Maul's is at $4\mathrm{.}0$ C and Obi Wan's is at $31\mathrm{.}0$ C$?$ Assume that Obi wan plays the pitch correctly. 

 

   

 

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