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State whether the following is true or false.
Every aerosol particle in the atmosphere can act as a cloud condensation nucleus.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: D

Very small particles and insoluble hydrophobic particles require supersaturations the atmosphere does not reach. Only a fraction of the total aerosol population activates in any given cloud. The activated fraction varies with both composition and updraught speed.

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