Which of the following is an example of a type of noise control?

Sound-absorbing materials are a key method of noise control because they work to reduce the amplitude of sound waves in an environment. This attenuation of sound can help create a quieter setting, which is particularly important in areas where excessive noise can lead to communication difficulties or hearing damage. By using materials such as acoustic panels, carpets, or curtains that can absorb sound energy instead of reflecting it, the overall sound levels in a space can be significantly decreased, making it more comfortable and safer for individuals.

While personal protective equipment is important for hearing conservation, it focuses on protecting the individual rather than altering the environmental sound conditions. Exit signage does not have any noise control function, and lighting adjustments also do not impact sound levels. Thus, the use of sound-absorbing materials specifically addresses the need for controlling noise levels effectively.