Q.

Sound of wavelength λ passes through a Quincke’s tube, which is adjusted to give a maximum intensity I0. Through what distance should the sliding tube be moved to give an intensity I02.

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a

λ8

b

7λ8

c

λ4

d

3λ4

answer is A, D.

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Detailed Solution

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I02=4I04cos2(Δϕ2)   and  Δϕ=2πλ(2Δx)

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