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प्रश्न
What is the minimum distance needed for an echo?
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उत्तर
- The minimum distance required to hear an echo is 1/20th part of the magnitude of the velocity of sound in air.
- If you consider the velocity of sound as 344 ms-1, the minimum distance required to hear an echo is 17.2 m.
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संबंधित प्रश्न
Does sound follow the same laws of reflection as light does? Explain.
Which of the following statement best describes frequency?
Which property of sound leads of the formation of echoes ?
Name three devices which work on the reflection of sound.
The speed of sound in water is 1500 metres per second. How far away from an under-sea rock should a deep sea diver be so that he can hear his own echo ?
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 ?
A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 seconds respectively. What is the speed of sound in the air?
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?
Answer the following question in your own words.
What factors are important to get a distinct echo?
