CHEM 1A Lecture Notes - Lecture 5: Threshold Energy, Work Function

• School: UC-Irvine
• Department: Chemistry
• Course: CHEM 1A
• Professor: Amanda Brindley

Document Summary

Wave interference - waves with the same phase interfere constructively (they add), two waves make a larger one together // waves with different phase interfere de- constructively (subtract) Single/double slit // dark and light areas in interference pattern. E = hv = work function => threshold frequency // wave particle duality of light. Each metal has its own work function // light intensity at work function affects the amount of ejected electrons. Increase frequency above threshold frequency => increase speed of ejected electrons, amount doesn t change // kinetic energy increases too. Ke = hv - w // v = frequency // w = work function. Ke = (1/2)m(v^2) // m = mass of electron, 9. 11 10 31 kilograms. H = 6. 626 x 10 ^ (-34) j*s.