Question

curved sound board is used in a big hall

Answer 1

Curved sound boards are used in big halls so that they reflect the sound to the audience and it also helps the sound to spread equally in all the direction.

Answer 2

$\Large{\underline{\underline{\bf{Solution :}}}}$

Sound Boards and Curved Ceiling and Walls in Large Halls :

The arched ceiling and walls of large halls or auditorium often reflect the sound waves. These reflected sound waves interfere with the words of the speaker. This problem is solved by hanging curtains, putting up screens or by using sound boards. A sound board is often a concave rigid surface. The speaker is located at the focus of the sound board placed behind the speaker. The sound board the reflected sound waves parallel. This enable the sound to reach large distances.

The sound board prevents the spreading out of the sound waves in different directions.