Answer:
(d) The material generally used for
sound proofing of rooms like recording studio, cinema hall, auditorium which
absorb sound and facilitate in proofing is styrofoam. Ear plugs (device used by
working person of commercial and industrial zone) are made up of very fine
glass wood or cotton wood impregnanted with wax while earmuffs contain fluid
seals or plastic foam for absorbing sound.
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