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Felt and mineral wool are examples of ___________

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Felt and mineral wool are examples of ___________

(a) Non-porous rigid partitions

(b) Porous rigid materials

(c) Non-rigid porous materials

(d) Non-rigid non-porous materials

The question was asked in an international level competition.

This intriguing question originated from Acoustics topic in chapter Acoustics and Ventilation of Construction & Building Materials

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The correct choice is (c) Non-rigid porous materials

Best explanation: Felt and mineral wool are examples of non-rigid porous materials. These materials are not usually used for the purpose of noise reduction because the sound insulation provided by them is low as compared to the rigid materials.

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