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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.
Write about the sources of noise pollution. Give the impact of noise pollution on the human body.
Explain the Term: Decibel
Which of the following problems is not created by noise pollution?
Noise has adverse effects on our ______.
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 |
State briefly how is noise pollution detrimental to human health.
What are the hazards of noise pollution?
Mention any two ways to control noise pollution.
Name two harmful effects of noise pollution.
