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Mechanical Properties Of Fluids

Question
CBSEENPH11018910

Two closed organ pipes when sounded together produced 2.5 beats per second at temperature 300K. Find the number of beats produced in one second at temperature 312.12K.

Solution
Let l1 and l2 be the lengths of two pipes.
The number of beats produced by two pipes when sounded together is, 
straight b equals straight v subscript 1 minus straight v subscript 2 equals straight v open parentheses fraction numerator 1 over denominator 4 straight l subscript 1 end fraction minus fraction numerator 1 over denominator 4 straight l subscript 2 end fraction close parentheses 
where,
v be the velocity of sound.
Let v1 and v2 be the velocity of sound at 300K and 312.12K and band b2 be the number of beats produced per second respectively.
Thus, 
             space space straight b subscript 2 over straight b subscript 1 equals straight v subscript 2 over straight v subscript 1 equals fraction numerator square root of straight T subscript 2 end root over denominator square root of straight T subscript 1 end root end fraction 
rightwards double arrow         fraction numerator straight b subscript 2 over denominator 2.5 end fraction equals square root of fraction numerator 312.12 over denominator 300 end fraction end root equals space 1.02  
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#6 {main}</pre>, is the number of beats produced in one second at temperature 312.12 K.