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  • Question
  • 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

  • Correct Answer
  • a class of spectroscopic techniques which analyzes molecular motions 


  • Spectroscopy problems


    Search Results


    • 1. 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
    • 2. 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
    • 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. 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
    • 5. In the equation, A = ? bc, what quantity is represented by "?"?

    • Options
    • A. Absorbtivity
    • B. Molar absorbtivity
    • C. Path length
    • D. None of these
    • Discuss
    • 6. 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
    • 7. Molar absorbtivities of compounds exhibiting charge transfer absorption are

    • Options
    • A. small
    • B. moderate
    • C. large
    • D. none of these
    • Discuss
    • 8. 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
    • 9. 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
    • 10. Which of the following relationships between absorbance and %transmittance is incorrect?

    • Options
    • A. A = log10 100 / %T
    • B. A = 2 - log10 %T
    • C. A = log10 1 / T
    • D. All are correct
    • Discuss


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