1.

The length of two open organ pipes are l and \[(l+\Delta l)\] respectively. Neglecting end correction, the frequency of beats between them will be approximately [MP PET 1994; BHU 1995]

A.            \[\frac{v}{2l}\]                     
B.            \[\frac{v}{4l}\]
C.            \[\frac{v\Delta l}{2{{l}^{2}}}\]                                           
D.            \[\frac{v\Delta l}{l}\] (Here v is the speed of sound)
Answer» D.            \[\frac{v\Delta l}{l}\] (Here v is the speed of sound)


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