CH 301 Lecture Notes - Lecture 8: Photon, Organic Chemistry, Threshold Energy
Document Summary
Energy of radiation striking metal surface (e) (e=hv) is converted into energy needed to just allow the electron to escape the surface atom plus the kinetic energy of the electron as it flies off into space. Plot of ke vs. frequency is a straight line. Slope is the same for any metal 6. 626x10^-34, planck"s constant. Work function: energy to just liberate an electron e=hv0. Excited atoms only emit light at discrete wavelengths. Electrons must only make transitions b/w discrete energy level. The calculations of the emitted wavelength upon the release of an energy when an electron transitions from higher to lower energy. Rh=2. 8x10^-18: electrons have specific (quantized) energies, light is emitted as e^- moves from one level to another. For other elements: e=z^2 r(1/n^2f-1/n^2i) z= atomic number. Louis de broglie proposed: the wavelength associated with a moving particle is inversely proportional to its momentum (mass x velocity)
