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Why does visibility fall sharply when the number of fog droplets increases?

Answer and explanation

Correct answer: More droplets scatter more light

The correct answer is A: more droplets scatter more light. Fog consists of numerous tiny liquid-water droplets suspended close to the ground. Light travelling from an object to an observer encounters these droplets, and the light is redirected in many directions. With a greater number or concentration of droplets, more scattering occurs, less direct light reaches the eye, and the background appears blurred or hidden. This is why dense fog produces much poorer visibility than thin mist. B is wrong because droplets do not remove gravity. C is wrong because ordinary fog droplets do not lift soil. D is wrong because the issue is not a colour change in water vapour; it is the interaction of light with suspended droplets. Memory cue: denser fog means more droplets, more scattering, and less clear vision.

Related tags

Dense FogDroplet DensityVisibilityForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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