A room with hard, flat surfaces such as concrete, tile, or glass will most likely produce an echo.
glass
A room with hard, smooth surfaces, such as bare walls, tiled or concrete floors, and glass windows, is more likely to produce an echo. These surfaces reflect sound waves rather than absorbing them, resulting in the sound bouncing off the surfaces and creating an echo.
A room with hard and smooth surfaces, such as bare walls, tiled or hardwood floors, and glass windows, will most likely produce an echo. These surfaces reflect sound waves back into the room, bouncing them off multiple surfaces before they are absorbed or dissipated. This causes the sound to linger and creates the sensation of an echo. So, if you're looking to create an echo, find a room with these types of surfaces. However, it's important to note that excessive echo or reverberation can be undesirable in many situations, such as in a recording studio or a classroom, as it can adversely affect speech clarity or audio quality.
