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The coalescence efficiency for two colliding cloud droplets is usually

  • A.highest for the very largest drops in the distribution
  • B.close to one for small droplets and lower for large ones
  • C.close to zero for droplets of every size
  • D.exactly one for every possible pair of droplets

Answer: B

Small droplets almost always merge on contact, whereas large drops may bounce or separate again after temporary union. Grazing collisions between large drops are the least likely to end in a permanent merger. Grazing geometry and high impact energy both work against union.

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