Question

why the walls of film halls are not smooth
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Answer 1

Answer:

Because the (may not be) white and dark wall absorbs the sound that is reflected from a smooth wall causing an effect of echo and disturbing the audience from clearly hearing the sound .

Answer 2

Answer. because the (may not be) white and dark wall absorbs the sound that is reflected from a smooth wall causing an effect of echo and disturbing the audience from clearly hearing the sound