A) 2
B) 4
C) \[\frac{1}{2}\]
D) 1
Correct Answer: A
Solution :
Sabine's formula for reverberation time is \[T=\frac{0.16\,V}{\Sigma as}\] where V is volume of hall in \[{{m}^{3}}\]. \[\Sigma as={{a}_{1}}{{s}_{1}}+{{a}_{2}}{{s}_{2}}+......=\] total absorption of the hall (room) Here, \[{{s}_{1}},{{s}_{2}},{{s}_{3}}....\]are surface areas of the absorbers and \[{{a}_{1}},{{a}_{2}},{{a}_{3}}\]....... are their respective absorption coefficients \[\therefore \frac{T'}{T}=\frac{V'}{s'}\times \frac{s}{V}\] \[=\frac{{{(2)}^{3}}}{{{(2)}^{2}}}=\frac{8}{4}=2\] Hence, \[T'=2T=2\times 1=2s\]You need to login to perform this action.
You will be redirected in
3 sec