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All of the following increase the collection kernel between two drops EXCEPT

  • A.a larger difference in their fall speeds
  • B.a larger collector cross sectional area
  • C.a greater fraction of encounters ending in contact
  • D.a more nearly equal radius for the two drops

Answer: D

Equal radii mean equal fall speeds and almost no relative motion, which collapses the kernel. The other three each raise either the swept volume or the fraction of encounters that succeed. The kernel is the product of geometry, motion and efficiency.

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