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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.
Look at a cartoonist's presentation of a kind of pollution given below.
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- Name the kind of pollution.
- List the sources of pollution.
- Mention any two harmful effects of this pollution.
Which of the following problems is not created by noise pollution?
The sound which is disagreeable to the ears is called ______.
What are the hazards of noise pollution?
How does planting trees help in reducing noise pollution?
Name two harmful effects of noise pollution.
Unwanted disturbing sound, even if it is music next door, is noise.
People routinely working in noisy places are not much affected by noise.
