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Spectroscopy problems


  • 1. In the equation, A = ? bc, what quantity is represented by "?"?

  • Options
  • A. Absorbtivity
  • B. Molar absorbtivity
  • C. Path length
  • D. None of these
  • Discuss
  • 2. Why are rotational transitions of little use to a spectroscopist?

  • Options
  • A. Because the energy required to induce a rotational transition is so small that it cannot be measured
  • B. Because rotational transitions are extremely rare
  • C. Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
  • D. All of the above
  • Discuss
  • 3. Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?

  • Options
  • A. Because %T cannot be measured as accurately as absorbance
  • B. Because %T is dependant on the power of the incident radiation
  • C. Because absorbance is proportional to the concentration of the analyte, whereas %T is not
  • D. none of the above
  • Discuss
  • 4. A simple harmonic oscillator may absorb energy

  • Options
  • A. at anytime.
  • B. when the frequencies match exactly
  • C. when the amplitudes are the same.
  • D. at no time.
  • Discuss
  • 5. Beer's Law states that

  • Options
  • A. absorbance is proportional to both the path length and concentration of the absorbing species
  • B. absorbance is proportional to the log of the concentration of the absorbing species
  • C. absorbance is equal to P0 / P
  • D. none of the above
  • Discuss
  • 6. Vibrational spectroscopy is

  • Options
  • A. a large mass on a weak spring
  • B. a flashlight through a prism and shake it
  • C. a class of spectroscopic techniques which analyzes molecular motions
  • D. an Infrared spectroscopy
  • Discuss
  • 7. Molar absorbtivity is the measure of the

  • Options
  • A. amount of light absorbed per unit length
  • B. amount of light absorbed per unit concentration
  • C. amount of light reflected and absorbed per unit concentration
  • D. None of the above
  • Discuss
  • 8. Molar absorbtivities of compounds exhibiting charge transfer absorption are

  • Options
  • A. small
  • B. moderate
  • C. large
  • D. none of these
  • Discuss
  • 9. In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the

  • Options
  • A. the Fourier Transfer Algorithm allows us to scan all frequencies at once
  • B. light is faster today that it used to be
  • C. absence of broad spectrum of wavelenth
  • D. none of the above
  • Discuss
  • 10. UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s)?

  • Options
  • A. ? ? ?*
  • B. n ? ?*
  • C. n ? ?* and ? ? ?*
  • D. none of these
  • Discuss

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