Echoes are created when sound waves hit an obstacle and bounce back. The smoother the obstacle the sound wave hits, the clearer and louder the echo because the sound wave remains more intact when it hits a smooth surface than when it hits a rough one.
How is a echo produced?
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. Although the direction of the sound changes, the echo sounds the same as the original sound.
What conditions are needed to produce echo?
The necessary conditions for hearing an echo can be, The distance between the sound source and the place where it is reflected from must not be less than 17m and the period between hearing the original sound and its echo should not be less than 0.1 of a second.
What is the minimum distance needed for an echo?
Question: What is the minimum distance required to hear an echo? Answer: The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C. Therefore, the reflecting object must be more than 17.2m from the sound source for echo to be perceived by a person located at the source.
Where is an echo produced?
Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room. A true echo is a single reflection of the sound source.
What is the formula for echo?
For example, if the speed of sound in water is 1500 meters per second and the fisherman’s sonar device detects an echo in 0.02 seconds, the distance of the object under water will be d = v*t = 1500 meters per second * 0.02 seconds = 30 meters (back and forth).
What are the conditions required for reverberation?
A reverberation, or reverb, is created when a sound or signal is reflected causing numerous reflections to build up and then decay as the sound is absorbed by the surfaces of objects in the space which could include furniture, people, and air.
What is meant by an echo state two conditions necessary for an echo to be heard distinctly?
The conditions are- 1- The reflecting surface should have a larger reflecting surface than the wavelength of the sound. 2- The minimum distance to hear the echo should be 17m in the air or as described by the formula V t 2Concept: Reflection of Sound.
How far can an echo travel?
An echo can only be heard by humans when the distance between the source of the sound and the reflecting body is more than 50 feet in distance. A reverberation can occur when a sound wave is reflected off a nearby surface.
What is the maximum distance to hear an echo?
The minimum distance for echo to be heard is 17.2 m. But is there a maximum distance for echo to be heard? No, there is no maximum distance to hear an echo.
What is an echo what factors are important to get a distant echo?
The repetition of sound caused by its reflection off a hard surface is known as echo. Factors important to get a distinct echo are: The minimum distance between the source and reflector of sound should be 17 m. The size of reflector must be large enough as compared to the wavelength of the sound wave.
How is sound produced?
Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. As the particles vibrate, they move nearby particles, transmitting the sound further through the medium.
What would most likely transmit sound best?
In general, sound waves travel fastest in solids and slowest in gases. Sound waves travel fastest in solids (compared to liquids and gases) because solids are more dense. The fastest which sound can move is when it is moving through a vacuum.
How are echoes measured?
Clap-echo method
This method involves measuring the time taken for you to hear an echo from a sharp clap. You stand a long distance from a wall, clap, and listen for the echo. The distance travelled is twice the distance from you to the wall (because the sound has to travel to the wall and back).
How do you calculate cardiac output echocardiogram?
Work out the volume of the cylinder Multiply the area of the LVOT (a circle) by the length the blood travels and you get the stroke volume (ie volume ejected per beat) The stroke volume multiplied by the heart rate gives us the cardiac output (expressed as L/Min).
What is an example of an 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.An example of echo is a teacher agreeing with and repeating what a parent says.
Which wave property causes the echo?
The property of reflection of sound waves leads to the formation of Echo.
What is echo and its application?
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.
Which of the following is not a necessary condition for echo to be heard?
The echo can not be heared if the distance between the sound source and the reflecting surface is less than 17 metres because the time between hearing the main sound and its echo will be less than 0.1 of a second , and the human ear can not distinguish between the two successive sounds .
What is echo write two applications echo?
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.
Which substance will transmit sound the fastest?
Solids
Solids: Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air.
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