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प्रश्न
What is meant by an echo?
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
Does sound follow the same laws of reflection as light does? Explain.
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
What is the other name of a loud-hailer ?
On which day, a hot day or a cold day, an echo is heard sooner ? Give reason for your answer.
The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342 m/s, calculate the distance of the reflecting surface.
State the laws of reflection of sound.
State two conditions necessary for hearing an echo.
What are the medical applications of echo?
How can you calculate the speed of sound using echo?
To hear an echo, the minimum distance of the obstacle from the source of sound must be ______.
