Question

A-What is reverberation how can it be reduced

B-A sound wave travels at a speed of 399 metre per second if the wavelength is 1.5 m what is the frequency of the wave will it be audible

C-Why are the ceilings of concert halls curved

Answer 1

A.
DueDue to repeated reflection of sound waves, after sometime the source of the sound stops producing sound, this phenomena is called as reverberation. Consider, a source produces sound which gets scattered in all directions in a closed room. As a result, the wave reaches the wall and simultaneously gets reflected and reaches to other wall of the room and so on. Under these circumstances, repeated reflection of sound causes source to stop the producing sound.

Reverberation can be reduced if we can place some sound absorbing materials inside the room like curtains, plastic fireboard etc.

B.

Speed = frequency * wavelength

wavelength = 1.5 cm = 0.015 m

So, 399 = 0.015 * frequency

frequency = 399 / 0.015 = 26,600 Hz

No, it will not be in audible range because human can hear frequencies only ranging from 20 Hz and 20000 Hz

C.
Ceilings of concert halls are curved so that the sound after reflection reaches every corner of the concert hall and the audience can listen the sound clearly.