Question

A cinema Hall has volume of 7500 m³. It is required to have reverberation time of 1.61 seconds. The total absorption in the hall should be _______ (consider 0.161 as multiplication factor in the relevant formula)
1. 7500 sabians
2. 750 sabians
3. 1980 W-m²
4. 995 OWU

Answer 1

Correct Answer - Option 2 : 750 sabians

Total absorption in the hall = 0.161 × volume of hall/as

a is absorption coefficient

s is area of surfaces absorbing sound

\(T = \frac{{0.16 \times 7500}}{{1.61}} = 750\;sabians\)