Bonrheagraceviz
Answered

When does an echo CANNOT be heard?

A. If the original sound is too loud.

B. If we are far to a big hard wall.

C. If the reflecting surface is too big.

D. If we are too close to a big hard wall.​

Sagot :

Answer:

D. If we are too close to a big hard wall

Gratiaanaviz

Answer:

D. If we are too close to a big hard wall

Explanation:

The hard wall that is too close will obstruct the sound waves, and it will fail to echo.

hope it helps :>