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प्रश्न
Explain how lightning takes place.
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उत्तर
During the development of a thunderstorm, the air currents move in upward direction while the water droplets move in downward direction. These movements cause separation of charges. The positive charges collect near the upper edges of the clouds and negative charges collect near the lower edges of the clouds.
Accumulation of positive charges near the ground also takes place. When the magnitude of collected charges become large, the air cannot resist their flow and as a result, negative and positive charges meet producing streaks of bright light and sound, called lightning.
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संबंधित प्रश्न
Lightning conductors cannot protect a building from lightning.
Suggest three measures to protect ourselves from lightning.
The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain.
Explain why it is not safe to go out with an umbrella when there is heavy rain, lightning or thunder.
What are the remedial measures for the following calamity:
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______ is a device that protects building from lightning strike.
Consider the statement given below and choose the correct option.
Assertion: It is safer to stand under a tall tree during lightning.
Reason: It will make you the target for lightning.
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If air and cloud were good conductors of electricity, do you think lightning could occur? Explain.
______ is another example of discharge that takes place in clouds.
Huge quantities of electricity are discharged in lightning flashes and temperatures of over ______°C or more can be reached.
______ extreme heat will vaporize the water inside a tree, creating steam that may burn out the tree.
How can you save yourselves from lightning?
Sometimes lighting may be seen before the thunder is heard. Why?
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage. Assertion: It is safer to stand under a tall | tree during lightning.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
