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Q.

The length of two open organ pipes are l  and l+ΔlΔl<

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a

vΔl3l2

b

vΔl4l2

c

vΔl8l2

d

vΔl2l2

answer is D.

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Detailed Solution

Beat frequency  =f1−f2  =v2l−v2l+Δl =v2l1−1+Δll−1 =v2l1−1+Δll=vΔl2l2
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