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Turbulence is thought to assist collision growth chiefly by

  • A.increasing the relative velocities between nearby droplets
  • B.raising the supersaturation available for condensation
  • C.reducing the terminal velocity of the collector drops
  • D.preventing the breakup of the largest raindrops

Answer: A

Droplets of differing inertia respond differently to a turbulent eddy and so approach one another. The effect also concentrates droplets locally, which raises the encounter rate further still. Both effects grow stronger as the turbulence intensifies.

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