1.

Two identical flutes produce fundamental notes of frequency 300 Hz at \[{{27}^{o}}\]C. If the temperature of air in one flute is increased to \[{{31}^{o}}\]C, the number of the beats heard per second will be                                            [UPSEAT 2002]

A.            1    
B.            2
C.            3    
D.            4
Answer» C.            3    


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