What causes echo in a room?

Related questions

1. Is it bad to whisper?
2. Is whispering talking?
3. What is a whisper room?
4. What is the echo effect?
5. What is an echo study?
6. What does an echocardiogram tell you?
7. What are the two applications of Echo?
8. For what is the Gol Gumbaz at Bijapur famous?
9. What does an echo mean?
10. What is echo chamber effect definition?

Tags

1. #waves
2. #ceilings
3. #replacing
4. #echoes
5. #hardwood
6. #floor
7. #walls
8. #ceiling
9. #objects
10. #absorb
11. #reduce
12. #sound
13. #cause
14. #carpet
15. #hanging
16. #concrete
17. #acoustic
18. #drastically
19. #effect
20. #tiles