Question

Which of the following is a good absorber of sound a) glass b) water c) vacuum d) thermocol

Answer 1

VACCUM IS the good absorber of sound.
because Propagation of Sound needs a medium like air.
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Answer 2

Thermocol is a good absorber of sound. (Option d)

• When sound falls on material like that of sofa, fluffs and other light weight substances such as paper, clothes, thermocol, coating of plaster of Paris, curtains, carpets, wood, furniture etc., they absorb the sound to a very good extent. These are therefore called good absorbers of sound.
• Materials which are porous, soft and have a large sound absorption coefficient , are great absorbers of sound. Thermocol has all these qualities , so it is a good absorber of sound.
• Thermocol padding are also beneficial in auditoriums because they do no reflect or echo the sound by absorbing sound waves.

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