Echoes are used by bats, dolphins and fisherman to detect an object / obstruction. They are also used in SONAR (Sound navigation and ranging) and RADAR(Radio detection and ranging) to detect an obstacle.
What is the use of echo in physics?
The applications of echo: (i) Dolphins detect their enemy and obstacles by emitting the ultrasonic waves and hearing their echo. (ii) In medical science, the echo method of ultrasonic waves is used for imaging human organs such as the liver, gall bladder, etc. This is called ultrasonography.
What are the uses of multiple Echoes of sound?
Uses of multiple reflections of sound are: Sound producing devices that uses a conical shape like megaphones to increase the intensity of sound waves in particular directions. Stethoscope: Sound undergoes multiple reflections in the wires of the stethoscope.
How fishermen use echoes?
By hearing their echo and emitting the ultrasonic waves dolphins detect their enemy and obstacle. They hunt their prey by using ultrasonic waves. A fisherman sends an ultrasonic pulse from a source and receive the pulse from the fish. Hence fisherman use echoes to catch fishes.
What are the advantages of echo?
Echoes can be useful or a nuisance. In a concert hall echoes can ruin a performance if the walls and ceiling are not properly designed. If the walls are too hard or too flat they make good reflecting surfaces for the sound waves. Echoes can be used to give vital information.
What is an echo in music?
Echoes are sounds that are delayed far enough in time so that you hear each as a distinct copy of the original sound. When reverb or chorus might muddy the mix, both delays and echoes are a great way to add ambience to a track.
How is echo different from reverberation?
Reverberation is the persistence of sound after the sound source has been stopped. It results from a large number of reflected waves which can be perceived by the brain as a continuous sound. On the other hand, an echo occurs when a pulse of sound can be heard twice.
What is false echoes?
Indirect or false echoes are caused by reflection of the main lobe of the radar beam off ship’s structures such as stacks and kingposts. When such reflection does occur, the echo will return from a legitimate radar contact to the antenna by the same indirect path.
What is the application of sound?
Ultrasound waves are used to detect objects. A ringing telephone, a honking horn, and the sound of a friend’s voice are all reminders of how important sound is. But sound has uses that go beyond communication. For example, some animals and people use reflected ultrasound waves to detect objects.
Why do bats use echo for Class 8?
Echolocation is the use of sound waves and echoes to determine where objects are. Bats, for example, send out sound waves from their mouth or nose. When the sound waves hit an object they produce echoes thus helping them find their way around.
Which sound is audible to Dolphins?
Bottlenose dolphins hear tones with a frequency up to 160 kHz with the greatest sensitivity ranging from 40 to 100 kHz. The average hearing range for humans is about 0.02 to 20 kHz. In other studies, the hearing range for the bottlenose dolphin has been measured in 75 to 150,000 Hz (0.075 to 150 kHz).
What is the disadvantage of Echo?
question_answer Answers(1)
In a theatre or a concert hall, echoes can ruin a performance if the walls and ceiling are not properly designed. Multiple echos make words of a speaker unclear to the audience. Also echos cause disturbance while communicating.
Which remedies should you use to reduce the echo in Auditorium?
remedies to be used to reduce the echo in auditorium are:
- carpets can be put on the floor to absorb the sound.
- heavy curtains are put on doors and windows to absorb sound.
- panels made out of sound absorbing materials are put on the walls and ceilings.
What should you apply to the echo sounder reading to determine depth of water?
The time interval between emission and return of a pulse is recorded, which is used to determine the depth of water along with the speed of sound in water at the time.
Is echo a reverb?
Reverb is the same concept as an echo but with a smaller reflection time that often comes back within a second and conflates with the sound that hasn’t finished yet.
What are the effects of echo?
Echo effects are one type of audio effect based on delaying a signal over time. In this case, listeners perceive an audible repetition of a signal after some duration of time. Listeners perceive distinct echoes when the time delay is relatively long (greater than ~30 milliseconds).
What is example of echo?
Echo is defined as a sound repeating by sound wave reflection, having a lasting or far reaching impact, or repeating what someone else has said. An example of echo is the repeating of a sound created by footsteps in an empty marble hallway.
Why do we hear echoes?
Echoes. An echo is a sound that is repeated because the sound waves are reflected back. Sound waves can bounce off smooth, hard objects in the same way as a rubber ball bounces off the ground.That is why echoes can be heard in a canyon, cave, or mountain range.
How are unwanted echoes?
Indirect or false echoes are caused by reflection of the main lobe of the radar beam off ship’s structures such as stacks and kingposts. When such reflection does occur, the echo will return from a legitimate radar contact to the antenna by the same indirect path.
What is side lobe echoes?
Side lobe artifacts occur where side lobes reflect sound from a strong reflector that is outside of the central beam, and where the echoes are displayed as if they originated from within the central beam.These radial beams are called side lobe beams.
What is echo in radar?
radar echo – an electronic signal that has been reflected back to the radar antenna; contains information about the location and distance of the reflecting object. electronic signal – a signal generated by electronic means.
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