The Noise- Reduction Coefficient (NRC)of a Material Is Evaluated Between

question 11

Multiple Choice

The noise- reduction coefficient (NRC) of a material is evaluated between the frequency range of 250 Hz and 2 kHz because

• A)most of the sound energy in the noise produced in buildings lies in the given frequency range.
• B)most of the sound energy in human speech lies in the given frequency range.
• C)the human ear is insensitive to noise outside the above frequency range.
• D)it is virtually impossible to evaluate this property outside the above frequency range.
• E)none of the above.

---

Definitions:

Development Domain

Areas of growth and change in humans, typically categorized into physical, cognitive, social, and emotional domains.

Plan Actions

The process of outlining steps or strategies to achieve a specific goal or objective.

Motor Milestones

Key developmental stages where a child gains new abilities in physical movement, such as crawling, walking, or grasping.

Environmental Dangers

Refers to potential threats from the surrounding environment that can harm living organisms or ecosystems.