NCIDQ IDFX Practice Exam

What is the maximum possible coefficient of absorption for materials?

1. 0.5

2. 1

3. 2

4. 0.8

The correct answer is: 1

The maximum possible coefficient of absorption for materials is 1. This value indicates that a material can absorb 100% of the sound energy that hits its surface, leaving no reflection. In acoustic terms, a coefficient of 1 corresponds to a perfectly absorptive material, meaning it effectively eliminates echoes and reverberation in a space. This understanding is essential when selecting materials for interiors, particularly in spaces where sound quality is a priority, such as auditoriums, recording studios, and conference rooms. Materials are rated based on their sound absorption capabilities, and a coefficient of 1 serves as the benchmark for optimal performance. While materials can exhibit coefficients like 0.5 or 0.8, reflecting partial absorption and allowing some sound to bounce back, none can exceed the maximum limit of 1. Therefore, recognizing that no material can absorb more than 100% of sound energy solidifies the understanding that the maximum possible coefficient of absorption is clearly established at 1.