33. You have a laser (a monochromatic light source) and want to estimate the wavelength. Youdecide to use a reflective diffraction grating to do this. The light is incident on the grating at 20degrees with respect to normal. Using a grating with a groove distance of 5 um, the first-orderdiffraction, is found at an angle of -12.5 degrees. Determine the wavelength of the source.a) 500 nmb) 628 nmc) 808 nmd) 946 nme) None of the above34. In Raman spectrometry, Stokes lines havea) lower energy than that of anti-Stokes scattering.b) equal energy to that of anti-Stokes scattering.) higher energy than that of anti-Stokes scatteringd) none of the above35. Upon ionization of phenol in aqueous solution, maximal UV absorbance changes to longerwavelength.a) Trueb) False36. It takes longer time to observe fluorescence than phosphorescence.a) Trueb) False37. The vibrational motion of C-H stretching in ethylene as in the figurecan be detected bya) IR.b) Raman.c) IR and Raman.d) None of the above.38. In a chromatographic experiment, two components elute with retention times of 11.52 and12.76 minutes, respectively. The half-height widths of the peaks were determined to be 0.37and 0.42 minutes, respectively. Assuming Gaussian peak shapes, estimate the resolutionbetween the two peaks.a) 3.0b) 3.1c) 3.2d) 16e) None of the above.

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