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प्रश्न
Explain why, the flash of lightning reaches us first and the sound of thunder is heard a little later.
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उत्तर
Since light travels faster than sound, the flash of lightning is seen first and the sound of thunder is heard thereafter.
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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?
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.
Name the device which is used to address a small gathering of people.
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 the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
Answer the following question in your own words.
What is an echo?
What is an echo?
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?
