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All of the following raise the fraction of aerosol particles that activate in a cloud EXCEPT

  • A.a coating of hydrophobic organic material
  • B.a stronger updraught within the cloud itself
  • C.a more soluble particle composition overall
  • D.a larger mean dry particle size in the sample

Answer: A

A hydrophobic coating hinders wetting and raises the supersaturation required. The other three either supply more supersaturation or lower what each particle needs. Activation is always a contest between what is supplied and what is required.

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