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प्रश्न
What is an echo ? How is echo formed ?
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उत्तर
The repetition of sound caused by the reflection of sound is called echo. An echo is produced when sound is reflected from a hard surface such as a tall brick wall or a cliff.
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संबंधित प्रश्न
Explain why, the flash of lightning reaches us first and the sound of thunder is heard a little later.
Name the device which is used to address a small gathering of people.
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
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What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
Which of the following device does not work on the multiple reflections of sound waves ?
Answer the following question in your own words.
Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there.
What is 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?
