Which of the following changes will most likely reduce the clarity of an echo in a large room?
Adding thick curtains to the walls
An echo is a reflected sound; it is clearest when sound strikes hard, smooth surfaces that reflect most of the sound energy back.
Soft, porous materials such as thick curtains absorb sound energy instead of reflecting it, so the reflected sound becomes weak and the echo loses clarity. This is why auditoriums use curtains and other sound-absorbing materials.
Smooth ceramic tiles reflect sound well and would make the echo stronger, and the colour of the paint has no effect on sound reflection.
Hence, the answer is Adding thick curtains to the walls.
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