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प्रश्न
What is meant by an echo?
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उत्तर १
If a person stands at some distance from a wall or a hillside and produces a sharp sound, he hears two distinct sounds: one is original sound heard almost instantaneously and the other one is heard after reflection from the wall or hillside, which is called echo.
उत्तर २
The sound that keeps coming after reflecting off of a hard surface (such a cliff, a hillside, a building's wall, or the edge of a forest). It's referred to as an echo.
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संबंधित प्रश्न
What is the other name of a loud-hailer ?
Name the device which is used to address a small gathering of people.
In which medium, air or water, an echo is heard much sooner ? Why ?
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
What is the minimum distance needed for an echo?
State two conditions necessary for hearing an echo.
To hear an echo, the minimum distance of the obstacle from the source of sound must be ______.
Numerical problems:
An echo returned in 3s. What is the distance of the reflecting surface from the source given that the speed of sound is 330 ms-1?
