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प्रश्न
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
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उत्तर
The minimum distance in air required from a sound-reflecting surface to hear an echo at 20°C is 17.2 m.
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संबंधित प्रश्न
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?
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate 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.
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
What is an echo ? How is echo formed ?
Answer the following question in your own words.
What is an echo?
What is the minimum distance needed for an echo?
When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.
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?
