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Two identical flutes produce fundamental notes of frequency 300 Hz at 27ºC. If the temperature of the air in one of the flutes is increased to 31ºC. The number of beats heard per second will be :

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answer is B.

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Detailed Solution

$n = \frac{V}{4 l}$ and $V \propto \sqrt{T}$
$\frac{Δ n}{n} = \frac{1}{2} . \frac{Δ T}{T}$

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