Answer:
The
reflection of sound may take place at curved surfaces also. This fact is made
use of in the large halls to spread sound evenly throughout the hall. This is
done by using sound boards. The speaker is located at the focus of the sound
board (Fig.) and the concave reflecting sound boards are placed behind the
speakers in a large hall. The sound board prevents the spreading out of
the sound waves in various directions. It sends the sound waves from the
speaker at its focus, by reflection towards the audience. This helps in
making the. speech readily audible even at a distance.
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