Question

which of the following materials would be least effective in reducing noise in a public library?
glass walls
carpeting
acoustic paneling
heavy linen curtains

Explanation:

To reduce noise, materials that absorb or dampen sound (like carpeting, acoustic paneling, heavy linen curtains) are effective. Glass is a hard, smooth material that reflects sound rather than absorbing it, so glass walls would be least effective at reducing noise in a library.

Answer:

glass walls