Question 1 · 1 mark · Difficulty 1/3
Which of the following surfaces would MOST effectively reflect sound to produce a clear echo?
- A panel of acoustic foam
- A wall of smooth concrete
- A curtain of heavy fabric
- A hedge of dense bushes
Show answer & explanation
✓ Answer: B — A wall of smooth concrete
Hard, smooth, dense surfaces like concrete reflect sound efficiently, producing clear echoes. Heavy fabric, acoustic foam, and dense bushes are soft or irregular materials that absorb or scatter sound energy, reducing or preventing echo formation.