The human ear cannot distinguish between two successive sounds if the time gap between them is less than 0.1sec , and the place from where it is being reflected must be presented to hear the echo such as the walls, the mountains, or the water bodies.
Which of the condition is not necessary for the formation of echo?
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 are the 2 conditions for an echo to be heard distinctly?
The first condition is the minimum distance between source and reflecting surface should be 17.2m. 2-to hear a distinct echo, the interval between original and reflected sound 0.1 second.
In what conditions do sounds echo?
Echoes can be heard in small spaces with hard walls, like wells, or where there are lots of hard surfaces all around. That is why echoes can be heard in a canyon, cave, or mountain range. But sounds are not always reflected. If they meet a soft surface, such as a cushion, they will be absorbed and will not bounce back.
What is meant by echo what are the conditions necessary for its formation?
Echo is a repetition of sound due to the reflection of the original sound by a large and hard obstacle. Conditions for echoes: The minimum distance between the source of the sound and the reflector should be at least.The intensity or loudness of the sound waves must be sufficient.
What is an echo Class 9?
An echo is sound which is repeated. This is because sound is reflected back. Example- If we stand on top of mountain and shout our name. We hear the repetition of our sound.
What is echo shaala?
Solution. The sound heard after reflection from a rigid obstacle (such as cliff, a hillside, a wall of a building, edge of a forest etc.), is called an echo. Concept: Reflection of Sound. Chapter 3: Sound – Exercise 3.1 [Page 136] Q 12 Q 11Q 13.
What is an echo Class 10?
Echo The sound heard after reflection from a distant obstacle (such as a cliff, a hillside, etc.) after the original sound has ceased, is called an echo. Reverberation If the distance is less than 17 m, then the original sound mixes with the reflected sound.
What is echo Short answer?
Echo is the sound heard after reflection from a rigid surface such as a cliff, a hillside, the wall of a building etc.
What is an echo Class 8?
The echo: Sound heard after reflection from a surface is called echo. Just like heat or light, when sound falls on a surface, it is partly reflected and partly absorbed.
What is echo formation?
The repetition of sound caused by the reflection of sound waves is called an echo.Echo is produced when sound reflected from a hard surface i.e. brick wall mountain etc. as soft surface tends to absorb sound.
What are the applications of echo?
Applications of echoes
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 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 reflection of sound called?
Reflection of sound waves from a surface is called an echo or a reverberation. Sound waves can bounce off smooth or rough surfaces. It follows the law of reflection just like a light wave.
Why is echo used in sonar?
Echo sounding is a type of sonar used to determine the depth of water by transmitting acoustic waves into 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.
What is echo method in physics?
Echo method:
An echo is the phenomenon of repetition of sound on reflection from an obstacle. Here, a sound wave is sent to the obstacle and we observe the time it takes to return.
What is an echo science class 7?
Answer: An echo is heard when the time interval between the original sound and the reflected sound is at least 0.1 s. The speed of sound in a medium increases with an increase in temperature.
What do you mean by an echo 11th class?
Hint: Echo is the term which is related to the sound. It is based on the concept of reflection of sound. It is the reflected sound that we hear after the original sound has diminished.
What is noise class8?
?Sounds that are loud and unnecessary are called noise. The presence of loud, unwanted and disturbing sound in our environment is called noise pollution.
Why do some sounds not produce an echo?
For a sound to bounce back and make an echo, there has to be a lot of space between the sound source and the thing (wall or mountain) that it hits and bounces back.If there’s no big space, it won’t sound like an echo because the sound that comes back will get mixed up with the original sound.
What is echo effect?
Echo effects are one type of audio effect based on delaying a signal over time.Listeners perceive distinct echoes when the time delay is relatively long (greater than ~30 milliseconds). When a time delay is short, listeners do not perceive echoes. Instead, a single fused sound is perceived.
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