Question

Reverberation time does not depend upon

• A. temperature
• B. volume of room
• C. size of window
• D. carpet and curtain

Answer 1

Answer: (A)

temperature

Answer 2

Acoustics of buildings is a branch of physics which deals with the design of buildings like cinema halls, concerts halls, theatres, auditorium etc., in order to provide a pleasant sound system in the building. Sabine was the first to analyse this aspect of the buildings. He introduced the concept of reverberation time. The phenomenon of persistence of sound after the source has actually stopped producing sound is called reverberation of sound. The time for which sound continues to be heard after the source has stopped producing sound is called reverberation time. Sabine formula for reverberation time of a hall is $T=\frac{0.16 V }{\Sigma a s}$ where $V$ is volume of the hall in $m^{3}$ and $\Sigma a s=$ total absorption of the hall. In particular, reverberation time of a hall is adjusted by providing a few open windows, covering the walls with absorbing materials, using heavy curtains with folds and using upholstered seats in the hall. It has been established that for speech, optimum value of reverberation time is $0.5\, s$ and for music, the optimum value of reverberation time lies between Is to $2 \,s$. A room with zero reverberation time is called a dead room.