Reverb time is the time it takes for an impulse to decay by a certain dB level in a space. The ships or submarines send the ultrasonic waves in water and then analysed the received signal to detect unseen objects such as broken or sunken ships, iceberg, sea hills.Reverberation or Reverb happens when a sound is reflected. Sound waves are the result of vibrations.Īnswer: SONAR is a hearing technique which is in use in ships, submarine to detect unseen objects in the sea. Q.2: Write three characteristics of sound waves.Īnswer: Sound waves propagate as a mechanical wave. We can minimize reverberation by covering the ceiling and walls which has sound-absorbing materials. Q.1 Describe reverberation and how can we minimize reverberation?Īnswer: In large hall due to the repeated reflection persistence of sound can happen. Due to this reason sound is distributed uniformly all over the auditorium or halls. The sound falls in the concave soundboard from a different direction and reflected back from the concave surface in the same direction so that the sound can’t spread in various directions. The shape of the soundboard is concave and the board is placed behind the speaker in large auditorium and halls so that the sound can easily be heard to the person who is sitting in a considerable distance. Very few people can hear improved voice by hearing aid. But this hearing add treatment is not very much beneficial. Now the receiver sends the amplified sound to the ear of the patient. The working principle of the hearing aid is a small microphone is there which picks up the sound and the amplifier makes the sound louder. It is a battery-powered electronic device which is designed small enough to wear in or behind the ear. Hearing Aid is a device which is used to improve the hearing of a person who has a disability of hearing. In SONAR the ship or submarine send ultrasonic sound waves and then the received signal is analysed to detect the unseen objects. 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.Ģ FAQs about Sound Reflection Reflections of 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. Sound travels in all medium and spreads in all directions.
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