2. What type of transition occurs when a photon with 3.91 x 1021 J of energy is absorbed by methyl ethyl ketone? (Hint: use units of cm, mm, um, or Angstrom for wavelength.) a) spin (cm) b) rotational (mm) c) vibrational (um) d) electronic (A) 3. The best source for IR absorption is a) Ar lamp b) D lamp c) Nichrome wire d) Hollow cathode lamp 4. What is the refractive index of cobalt glass when the sodium line impinges on the interface between the glass and an aqueous solution at an angle of incidence of 15.5 deg? The angle of refraction is 5.5 deg, and the refractive index of the solution is 1.55. a) 3.39 b) 0.54 c) 1.86 d) 4.32 5. A reflective diffraction grating contained 1750 grooves/mm. The angle of incidence of a band of polychromatic radiation was 48.2. Determine the wavelength of the third order reflection that was diffracted at an angle of 11.2. a) 178 mm b) 356 mm c) 534 nm d) 1.78 x 10 nm 6. What is the second-order reciprocal linear dispersion (in A/mm) of a monochromator with a focal length of 0.65 m equipped with a grating having 2250 lines/mm? a) 6.8 A/mm b) 3.4 x 10-6 A/mm c) 3.4 A/mm d) 0.34 A/mm 7. An f/2 monochromator collects more or less light than an f/8 monochromator? How much more or less? a) more; 6 times b) more; 16 times c) less; 6 times d) less; 16 times