Question

Which of the following is not a property of good acoustic materials?

(a) They have a low coefficient of absorption

(b) They are comparatively cheap

(c) They are durable

(d) They are efficient over a wide frequency range

This question was posed to me in an internship interview.

I need to ask this question from Common Acoustical Defects in section Acoustics and Ventilation of Construction & Building Materials

Answer 1

Correct answer is (a) They have a low coefficient of absorption

For explanation I would say: Good acoustic materials are comparatively cheap and durable. They have a high coefficient of absorption and are efficient over a wide frequency range.