Spectroscopy problems
- 1. 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
Correct Answer: A = log10 1 / T
- 2. 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
Correct Answer: The diffraction grating
- 3. 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
Correct Answer: Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
- 4. Which of the following is not an IR vibrational mode?
Options- A. Stretching
- B. Scissoring
- C. Rocking
- D. Rolling Discuss
Correct Answer: Rolling
- 5. 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 Discuss
Correct Answer: A small mass on a stiff spring
- 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
Correct Answer: 1870-1650
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