Question

Why is the ceiling of concert halls, cinema halls made curved?
A. to make the hall beautiful.
B. for proper light conditions.
C. so that the sound can reach all corners properly.
D. so that the picture or the stage can be visible to each and every person.

Answer 1

Hint: By using curved reflector, the sound waves spread uniformly throughout the concert halls, cinema halls. This is one of the uses of reflection of sound to enhance the effect of sound.

Complete step by step answer:
The ceiling of concert halls and cinema halls are made curved so that the sound can reach all corners properly.
This is because the sound after reflection reaches all corners of the hall uniformly. The sound after reflection from the curved surface reaches all corners of the hall evenly. The sound wave after being reflected from a convex surface is spread out and so it is easily actuated and weakened whereas, if it is reflected from the concave surface, it will converge at a point and this can be easily amplified. The parabolic reflector which is used to focus the sound precisely to a point is used in designing the parabolic reflectors which are known as high directional microphones.

So, the correct answer is “Option C”.

Note:
The range of reflected sound waves in a parabolic reflector is maximum. The difference between the spherical and parabolic sound reflector is that a parabolic reflector will focus the parallel waves into a point while in the spherical reflector, the reflected wave focuses at a point only when the object is at the center of the curvature of the reflector.