Discussion
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- Question
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
- Correct Answer
- the Fourier Transfer Algorithm allows us to scan all frequencies at once
- 1. Molar absorbtivities of compounds exhibiting charge transfer absorption are
Options- A. small
- B. moderate
- C. large
- D. none of these Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. Which of the following components of a monochromator is the dispersing element?
Options- A. The collimating lens
- B. The entrance slit
- C. The diffraction grating
- D. None of these Discuss
- 9. Why must the voltage supplied to a tungsten lamp be very stable?
Options- A. Because if it wasn't, the lamp would bum out
- B. Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
- C. Because the lamp will only function at a specific voltage
- D. All of the above Discuss
- 10. Which of the following is not an IR vibrational mode?
Options- A. Stretching
- B. Scissoring
- C. Rocking
- D. Rolling Discuss
Spectroscopy problems
Search Results
Correct Answer: large
Correct Answer: amount of light absorbed per unit concentration
Correct Answer: a class of spectroscopic techniques which analyzes molecular motions
Correct Answer: absorbance is proportional to both the path length and concentration of the absorbing species
Correct Answer: when the frequencies match exactly
Correct Answer: n ? ?* and ? ? ?*
Correct Answer: A = log10 1 / T
Correct Answer: The diffraction grating
Correct Answer: Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
Correct Answer: Rolling
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