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Please show the derivation of the formula step by step D stands for directivity index alpha stands for coeeficiet V is volume Reverberant time with

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Please show the derivation of the formula step by step

D stands for directivity index

alpha stands for coeeficiet

V is volume

Reverberant time with air absorption -mr n From: D, = D. (1-)" 55.262V Prove that: T, c(a +4mV)

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