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
Correct Answer: Molar absorbtivity
- 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
Correct Answer: Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
- 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
Correct Answer: Because absorbance is proportional to the concentration of the analyte, whereas %T is not
- 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
Correct Answer: when the frequencies match exactly
- 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
Correct Answer: absorbance is proportional to both the path length and concentration of the absorbing species
- 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
Correct Answer: a class of spectroscopic techniques which analyzes molecular motions
- 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
Correct Answer: amount of light absorbed per unit concentration
- 8. Molar absorbtivities of compounds exhibiting charge transfer absorption are
Options- A. small
- B. moderate
- C. large
- D. none of these Discuss
Correct Answer: large
- 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
Correct Answer: the Fourier Transfer Algorithm allows us to scan all frequencies at once
- 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
Correct Answer: n ? ?* and ? ? ?*
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