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Question

A sound wave has a wavelength λ. The distance between the first compression and the fourth rarefaction is

A
2.5 λ
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B
λ
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C
3.5 λ
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D
5 λ
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Solution

The correct option is C 3.5 λ

Distance between two successive rarefactions is λ (wavelength) and that between an adjacent compression and rarefaction is λ/2. Hence, distance between first compression and fourth rarefaction is 3.5λ.

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