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Account for the following :(a) Artificial rain can be caused by spraying electrified sand on the clouds.(b) Electrical precipitation of smoke. |
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Answer» (a) Clouds are colloidal dispersion of water particles in air. These water particles carry some charge over them. On spraying oppositely charged colloidal dust or sand particles over a cloud from an aeroplane, the colloidal water particles present in the cloud will get neutralized and as a result they will come closer and will grow in size to form bigger water drops and ultimately will coagulate or precipitate causing artificial rain. |
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