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A cloud condensation nucleus counter measures the number of particles that

  • A.carry a specified quantity of electric charge
  • B.activate at a specified supersaturation
  • C.are larger than a specified diameter
  • D.scatter light at a specified wavelength

Answer: B

The instrument exposes the sample to a controlled supersaturation and counts the droplets that grow. Reporting a nucleus concentration without stating the supersaturation is therefore meaningless. Instruments are commonly operated at a set of fixed reference values.

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