The Wave N

Notes

The Wave Nature of Light 1. wavelength (): distance wave travels in one cycle (m) 2. frequency (): number of wave cycles to pass a given point per unit of time; measured in cycles/sec (Hertz) or s-1 3. Amplitude: intensity/brightness of radiation The wave properties of light are described by three variables: Macroscopic – Light moves as waves Microscopic – Light moves as discreet particles Properties of Waves Speed of light (c):= 3.00 x 108 m/s Planck’s constant (h): = 6.626 x 10-34 J*s The relationships between frequency, wavelength, and energy E = h = hc  = c  = c    As the wavelength (m) decreases from A to C, the wave's frequency (s-1) and its energy (E) increases. Electromagnetic Spectrum 1 meter = 1 x 109 nm The visible region of the electromagnetic spectrum is divided into colors based on wavelength. Light consists of electromagnetic radiation with an electric field component and a magnetic field component that travel in mutually perpendicular planes through space. The Bohr Model of the H Atom E = Efinal – Einitial = – 2.18x10-18 J 1 n2initial 1 n2final – E < 0 : emission E > 0 : absorption deBroglie Wavelengths of Objects Substance Mass (g) Speed (m/s)  (m) Slow...