Lightning
Lightning
Lightning: lightning occurs because of a massive electric charge flowing from cloud to cloud, from one part of the cloud to another, or from a cloud to the ground. Thunder clouds carry electric charges, and these charges separate out within the cloud. The lower portion of a cloud generally carries negative charges and the upper portions carry positive charges. These charges keep building up. Normally, charges do not flow easily through air. Air is an insulator, but when a huge amount of charges builds up, the insulating property of air breaks down. The path of conductive air (due to charged particles) which extends from the thundercloud is made by what is called a step leader. The step leader is not as bright as the flash of lightning. A very large amount of electric current is generated during a lightning strike. The air in the path of lightning heats up enormously. The enormous amount of heat produced makes the air expand very suddenly. This causes a wave of vibrations (called a shock wave), which is the cause of the thunder.
Uses of lightning: Lightning which was feared at one time is now useful in many ways. The uses of lightning are:
The lower portion of a cloud generally carries __________________ | |||
| Right Option : D | |||
| View Explanation | |||
The streaks of bright light seen during lightning is essentially the path followed by ____________________ | |||
| Right Option : C | |||
| View Explanation | |||
Lightning occurs due to ________________ | |||
| Right Option : B | |||
| View Explanation | |||
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