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The molar absorptivity of a substance is a measure of how strongly it

  • A.scatters light at a given wavelength
  • B.fluoresces after absorbing light
  • C.dissolves in the chosen solvent
  • D.absorbs at a given wavelength

Answer: D

Correct answer: absorbs at a given wavelength

Molar absorptivity \( \varepsilon \) is the constant in \( A = \varepsilon c l \), and it measures how efficiently the substance absorbs at the chosen wavelength. Values run from a few units for a forbidden transition to over \( 10^5 \) for a strongly allowed one, and a large value is what makes a method sensitive - it is the reason a strongly absorbing derivative is often formed before measurement.

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