What will happen when sound is focussed to a particular area?

Echoes are produced

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Interference occurs

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Sound becomes inaudible

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Frequency of sound becomes high

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Solution

The correct option is B
Interference occurs

When sound waves are produced in a hall, it reaches the observer directly as well as after reflections from walls, floors, ceilings etc. Thus when sound is focussed to a particular area it is possible that interference is produced between the waves, which in turn affect the originality of the sound.

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