Discussion
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- Question
Which of the following will oscillate the fastest?
Options- A. A large mass on a weak spring
- B. A large mass on a stiff spring
- C. A small mass on a stiff spring
- D. A small mass on a weak spring
- Correct Answer
- A small mass on a stiff spring
- 1. Which of the following is not an IR vibrational mode?
Options- A. Stretching
- B. Scissoring
- C. Rocking
- D. Rolling Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. Where does a carbonyl (C=0) stretch appear in an IR spectrum?
Options- A. 1740-1720
- B. 1870-1650
- C. 3640-3250
- D. 160-110 Discuss
- 7. What is the relationship between wavelength and wave number?
Options- A. Wavenumber = 1 / wavelength in centimeters
- B. Wavenumber - wavelength in nanometers = 1
- C. Wavelength in nanometers x wavenumber = 1
- D. None of the above Discuss
- 8. Why must the radiation source for fluorescence spectrometry be more powerful than for absorption spectroscopy?
Options- A. Because the magnitude of the output signal is proportional to the power of the incident radiation
- B. Because the sample won't fluoresce if the incident radiation is of low power
- C. To allow for scattering by the sample
- D. None of the above Discuss
- 9. Why phosphorescence measurements are usually made at a low temperature?
Options- A. To prevent thermal degradation of the phosphorescent species
- B. To promote phosphorescence by slowing the rate of radiationless transfer processes
- C. To increase the efficiency of the detector
- D. To decease the efficiency of detector Discuss
- 10. In the intersystem crossing
Options- A. the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa)
- B. a molecule converts its excess energy to light, and emits a photon
- C. a molecule converts excess electronic energy to vibrational energy
- D. all of the above Discuss
Spectroscopy problems
Search Results
Correct Answer: Rolling
Correct Answer: Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
Correct Answer: The diffraction grating
Correct Answer: A = log10 1 / T
Correct Answer: n ? ?* and ? ? ?*
Correct Answer: 1870-1650
Correct Answer: Wavenumber = 1 / wavelength in centimeters
Correct Answer: Because the magnitude of the output signal is proportional to the power of the incident radiation
Correct Answer: To promote phosphorescence by slowing the rate of radiationless transfer processes
Correct Answer: the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa)
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