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प्रश्न
Boojho saw a cracker burst at night at a distance from his house. He heard the sound of the cracker a little later after seeing the cracker burst. Give reason for the delay in hearing the sound.
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उत्तर
The light travels faster than sound. So, the light from the cracker reaches faster than that of sound of the cracker.
Speed of light in air = 3 × 108 m/s
Speed of sound in air = 330 m/s
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संबंधित प्रश्न
Name one source of sound causing noise pollution.
Mention any two measures to minimise noise pollution.
Explain the Term: Decibel
Write the answer in your own words.
What measures will you take to control noise pollution?
Complete the table.
| Nature of sound | Unpleasant | Pleasant |
| Speaking | ||
| Whispering | ||
| Aeroplane sounds | ||
| Horns of Vehicles | ||
| Railway Engine | ||
| Rustling of leaves | ||
| Neighing of a horse | ||
| Ticking of a clock |
Which of the following may be caused by noise?
How does planting trees help in reducing noise pollution?
Among the following which one is not polluted by noise pollution?
Lcrud noise or even loud music can damage our eyes.
Unwanted disturbing sound, even if it is music next door, is noise.
