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Assertion (A): Older aircraft measurements of ice crystal concentration may have been overestimates.
Reason (R): Large particles shattering on the probe inlet were counted as many small ones.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both are true and the reason gives the artefact, and modified probe tips have since reduced it substantially. Some historical reports of extreme concentrations are now regarded with caution. Instrumental artefacts can mimic real secondary production.

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