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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
List sources of noise pollution in your surroundings.
What is meant by noise pollution?
Look at a cartoonist's presentation of a kind of pollution given below.
 |
- Name the kind of pollution.
- List the sources of pollution.
- Mention any two harmful effects of this pollution.
Write about the sources of noise pollution. Give the impact of noise pollution on the human body.
The sound which is disagreeable to the ears is called ______.
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 |
Short answer type question
Dandiya raas is not allowed after 10.00 pm. Why?
Lcrud noise or even loud music can damage our eyes.
List three sources of noise pollution in your locality.
Define the following term:
Noise
