front 1 Spectroscopy  back 1 the theoretical approach to the science of studying the interaction between matter and radiated energy 
front 2 Spectrometry  back 2 the practical application of spectroscopy 
front 3 Spectrometry uses instruments called  back 3 spectrometers 
front 4 Spectrophotometry  back 4 the method used to measure how much achemical substance absorbs light as a beam of light passes through asample solution 
front 5 Spectrophotometers  back 5 the instruments used to quantitatively measure the reflection or transmission properties of a material as a function of wavelength (a spectrum) 
front 6 Spectrum  back 6 the reflection or transmission properties of a material as a function of wavelength 
front 7 Light behaves as: (2)  back 7 a WAVE and a PARTICLE 
front 8 Light as a WAVE  back 8  has a wavelength and frequency  exhibits the wave phenomena of interference, diffraction, and reflection.  Wave properties govern light behavior such as interference and diffraction 
front 9 Wave properties govern light behavior such as  back 9 interference and diffraction 
front 10 Light as a PARTICLE (a photon)  back 10  carries a discrete energy that can be absorbed or emitted by a molecule.  The interaction of light with chemicals is described using the particle nature of light—the photon and its energy 
front 11 Light waves consist of  back 11 perpendicular, oscillating electric and magnetic fields 
front 12 Wavelength, λ  back 12 the distance between wave crests 
front 13 Wavelength units  back 13 m, µm, nm 
front 14 Wavenumber (v)  back 14 a measure of spatial frequency (v = 1/λ) 
front 15 Frequency, ν  back 15

front 16 Speed of light, c, formula  back 16

front 17 Light has a duality of  back 17 WaveParticle 
front 18 What is the smallest amount of light that can be generated by a light source?  back 18 A photon is the smallest amount of light that can be generated by a
light source. 
front 19 The energy of a photon can be calculated from its  back 19 frequency 
front 20 Photon energy formula  back 20 E_{photon} = hν where h = Planck’s constant = 6.626 × 10^{34} J∙s 
front 21 Constants  back 21 c = 2.998 × 10^{8} m/s (the speed of light in a
vacuum) 
front 22 Equations  back 22 v = 1/λ (conversion equation between wavelength and wavenumbers) λν = c (equation for speed of light in a vacuum) E_{photon} = hν (equation for energy of a photon of light) E = hν = hc/λ = hcv 
front 23 Our eyes only see a fraction of the light in the universe. T/F?  back 23 True 
front 24 Spectrophotometry  back 24 Any technique that uses light to measure chemical concentrations 
front 25 Absorption Spectrophotometry  back 25 Any technique that uses the absorption of light to measure chemical 