Question

In an auditorium or big hall excessive reverberation is highly _______.
A. undesirable
B. desirable
C. zero
D. none of the above

Answer 1

Hint: Reverberation is the phenomenon of multiple reflection of sound waves after emerging from the source in the entire space around it. A light or a sound wave can undergo reflections when it strikes on a smooth surface. In reflection there is no change in the wavelength or the speed of the wave. But unlike refraction there is change in the wavelength and the speed of the wave.

Complete answer:
Sound created in a big hall will persist by repeated reflection from the walls until it is reduced to a value where it is no longer audible. The repeated reflection that results in this persistence of sound is called reverberation. In an auditorium or big hall excessive reverberation is highly undesirable, as excessive reverberation will lead to an increase in sound of disturbance and notice in the entire surrounding.

So, the correct option is A.

Note: Reverberation time is known as the time in which sound emerging from any source would eventually fade away after suffering few or multiple reflections from different surfaces.Good sound absorbers reduce the frequency of reflections and hence reverberation time is reduced.In general, in construction of such large halls, walls are made up of such materials that can absorb sound waves incident on them to much extent so that excessive reverberation can be avoided. Walls of halls are made such that the effective reverberation time could be reduced.