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Submarine, ship all use SONAR to detect underwater objects such as submerged submarine, sunken ships, iceberg etc. In sound navigation and ranging, technique or SONAR experts use echo. They also use echo to navigate in the ocean. Bats and dolphins use echo to detect obstacles. This is the reason echo can be heard when the sound reflects from a hard surface, walls, mountain, tunnels. If sound falls in a soft surface such as it can’t reflect. Echo sounds same as original sound although sound changes its direction. Sound can bounce off from the surface as rubbers ball bounces off the ground. Application of Reflection of Sound Echo:Įcho is basically repeated sound as sound waves are reflected back from the hard and uneven surface. ii) Incident sound, reflected sound and normal sound all belong in the same plane. Two laws of sound are- i) The angle of incident is equal to the angle of reflection. Also the reflected sound, incident sound and normal sound all belong to the same plane. In case of sound also the angle of reflection of sound is equal to the angle of incident of sound. Sound is similar to light and it propagates like a mechanical wave through the medium of air and water. Big walls of the building, mountains, tunnels can produce echo from the original sound. The sound which reflects back from the sound is known as an echo. Sound falls in the surface and reflects back from the surface to the ear. Like light sound is also reflected from the surface. Here the hard surface acts as a reflection mirror. The laws of reflection of light are also similar to the laws of reflection of sound. Sound reflection is similar to the reflection of light. Due to this reason in big auditorium backstages have a curved surface so that sound can be better projected and heard. Megaphone is a large funnel-shaped device which is used to channelize the sound in a particular direction. Megaphone is a device where the sound is directed. We can direct the sound and we can receive the sound in a particular direction. In case of a massive explosion, we hear the sound equally in all directions surrounding the explosion.
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Sound travels in all medium and spreads in all directions.