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Sample presentation affects a measurement principally through

  • A.the area measured, the backing and the number of layers
  • B.the temperature of the room during measurement
  • C.the time of day at which the reading is taken
  • D.the name of the operator who performed the measurement

Answer: A

Correct answer: the area measured, the backing and the number of layers

All three change what the instrument sees. The area determines how much of a non-uniform surface is averaged; the backing matters wherever light passes through the sample and returns; and the number of layers determines whether it is opaque at all. Each must be recorded with the measurement if it is to be reproduced.

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