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A raindrop of about 2 millimetres diameter falls at roughly

  • A.6 to 7 metres per second
  • B.1 metre per second
  • C.20 metres per second
  • D.0.1 metres per second

Answer: A

Fall speed rises steeply through the drizzle range and then flattens for larger drops. The limiting value near nine metres per second is approached only by the very largest drops that survive breakup. Fall speed is therefore a poor discriminator among large drops.

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