Question

The absorption ratio of a surface is the ratio of ___________

(a) Sound absorbed to reflected sound energy

(b) Sound absorbed to incident sound energy

(c) Reflected sound energy to incident sound energy

(d) Incident sound energy to reflected sound energy

I have been asked this question in class test.

This intriguing question comes from Common Acoustical Defects topic in portion Acoustics and Ventilation of Construction & Building Materials

Answer 1

The correct answer is (b) Sound absorbed to incident sound energy

The explanation is: The absorption ratio of a surface is the ratio of sound absorbed to incident sound energy. The sound reducing the effect of an absorber is dependent on its area and on the efficiency of the material. It is indicated by the sound absorption coefficient.