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The effectiveness of a silver iodide nucleus depends strongly on

  • A.the colour of the flare producing it
  • B.the height above ground at which it was released
  • C.the temperature at which it is asked to act
  • D.the time of day at which it is released

Answer: C

Correct answer: the temperature at which it is asked to act

Silver iodide begins to nucleate at about −5 degrees and becomes effective at −8 to −10, so the same particle is useless in warmer cloud and active in colder. Knowing where in the cloud the temperature falls in that window is therefore the central targeting problem.

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