How is an echo formed? Sound waves bounce off a flat surface. Light wave passes through a shiny surface. Light waves go around a smooth surface. Sound waves travel into a soft surface.
An echo is formed when sound waves bounce off a flat surface, such as a wall or a building, and then return to the listener's ear. This causes the listener to hear the sound again after a short delay. The flat surface reflects the sound waves back towards the listener, creating the sensation of an echo.
In contrast, light waves do not typically form echoes in the same way that sound waves do. Light waves can be reflected off of shiny surfaces, but this reflection does not produce the same type of repetition and delay that is characteristic of an echo. Light waves may also be refracted or diffracted when passing through different surfaces, but these processes do not result in the formation of echoes.