CHEM 1E03 Study Guide - Final Guide: Alkali Metal, Photon Energy, Work Function

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1E03
• Professor: Randall S Dumont

Document Summary

Different colours of light result from different wavelengths and frequencies: less than red: infra (high wavelength, low frequency, more than blue/violet: ultra (high frequency, low wavelength, red light. A period is defined by the time it takes for one wavelength to pass through obstruction point. Except at absolute zero, all objects emit electromagnetic radiation due to thermal energy. Classical wave theory could not predict observed spectrum which led to the uv. In the diagram above, the red line represents the prediction of the classical wave theory whereas the black line represents the uv catastrophe theory. E = energy of photon (in j) h = planck"s constant = 6. 626 e -34 js. V = frequency (in hz) -> note: frequency is sometimes represented with f such as in the equation below. Evidence for particle - character of light (and of matter) Sufficiently increasing frequency photons eject electrons from metal"s surface.