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When condensation nuclei are numerous, cloud droplet number may increase but why may each droplet remain small?

Answer and explanation

Correct answer: Because moisture gets distributed over many surfaces

Answer: A. Condensation nuclei are tiny particles on which water vapour can condense. When many suitable nuclei are present, the available water vapour is shared among a larger number of particles. This can produce many droplets, but the amount of water available to each individual droplet is smaller, so each may remain small. Small droplets are easily kept suspended by air movement and do not necessarily become rain immediately. B is wrong because nuclei provide surfaces for condensation; they do not destroy water vapour. C is wrong because dust does not always stop rain and some particles actually help cloud formation. D is wrong because cloud droplets remain liquid or become ice, not rock. A useful cue is: more nuclei can mean more droplets, but less water per droplet.

Related tags

Condensation NucleiCloud DropletsDroplet SizeCloud MicrophysicsClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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