An observer receives waves directly from a source of sound distant $120\,m$ in a big hall. He also receives waves reflected from the mid-point of $25\,m$ high ceiling. The wavelength of sound for constructive interference to take place between two waves, must be :
Medium
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$\Delta x=130-120 \Rightarrow 10=n \lambda$
$\Rightarrow \lambda=10 / \mathrm{n}=10 / 1,10 / 2 \ldots$
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