Define (a) coherent radiation (b) superposition principle (c) refractive index of a medium (d) normal dispersion of a substance Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 77213_ch06_ptg01_119-147.indd 143 9/12/16 7:57 PM 144 Chapter 6 An Introduction to Spectrometric Methods QueSTIonS AnD ProBleMS (continued) *6-2 *6-3 *6-4 *6-5 *6-6 *6-7 *6-8 *6-9 *6-10 * 6 -11 (e) anomalous dispersion (f) work function of a substance (g) photoelectric effect (h) ground state of a molecule (i) electronic excitation (j) fluorescence (k) phosphorescence (l) transmittance (m) absorptivity (n) absorbance (o) vibrational relaxation