If T is the reverberation time of an auditorium of volume V then

(1) $T\propto \frac{1}{V}$

(2) $T\propto \frac{1}{{V}^{2}}$

(3) $T\propto {V}^{2}$

(4) $T\propto V$

(4) Reverberation time $T=\frac{kV}{\alpha S}$TV.

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