Question

Why echoes can't be heard in a small room?

• A. Because small rooms absorb more sound
• B. Because time gap between direct sound and reflected sound is too low to be perceptible by human ear
• C. Because small rooms reflect less amount of energy
• D. Because of multiple reflections in small rooms

Answer 1

The correct option is B

Because time gap between direct sound and reflected sound is too low to be perceptible by human ear

There should be a minimum gap of $0.1$ seconds between the direct sound and reflected sound to be perceptible by the human ear. In small rooms reflected sound comes back before $0.1$ seconds, so we are not able to hear echoes in small rooms.