CHEM 112 Study Guide - Final Guide: Lysine, Radical Initiator, Organic Reactions
Document Summary
Electric and magnetic fields perpendicular and in phase. Waves are characterized by wavelength (distance between two crests) frequency (number of oscillations per second) inverse to wavelength speed same speed in a vacuum. Interference of waves when amplitudes of two waves add together. Waves exactly in phase constructive interference amplitude increases. Waves exactly out of phase peak of one wave aligns with valley of other wave amplitudes cancel and become zero. Visible spectrum (between uv and infra-red): 390 nm (violet) 790 nm (red) Gamma rays x rays uv infrared microwave radio/tv. All elements have their own distinctive atomic spectra. Photoelectric effect: emission of electrons when frequency of the incident light (em) exceeds a specific threshold frequency. Stopping voltage is at 0 until threshold frequency is reached. Higher intensity of em waves= more ejected electrons but not higher energies. Photon hits surface, each photon carries e=hv of energy, 1 photon collides with 1 electron and transfers e=hv to the electron.
