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Cloud chamber experiments on collection are difficult chiefly because

  • A.the efficiency of collection is impossible to define
  • B.droplets fall out of the chamber before growing appreciably
  • C.supersaturation cannot be produced in a laboratory
  • D.condensation nuclei are unavailable for such work

Answer: B

Reproducing the depth and residence time of a real cloud in the laboratory is the practical obstacle. Levitation techniques and long fall tubes are among the approaches used to work around it. No laboratory can reproduce a kilometre of cloud depth.

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