CH 301 Study Guide - Midterm Guide: Notation3, Iwork, Electron Affinity
Document Summary
A traveling wave with oscillating electric and magnetic fields. Wavelength (cid:523) (cid:524): dist. between two corresponding points (m) Frequency (v): cycles/periods per time unit (s-1, hz) Visible light wavelength (meters): 700m (red) 400m (blue)|blue is the higher energy side, red is lower. Ionizing e- to higher energy states e- ejected from molecule. Energy of light is packaged up into small pieces. Ephoton = hv h= 6. 626 x 10-34 j s (ephoton) x (cid:523)avagadro"s number(cid:524)= emole. 1_ unless the light has a certain minimum frequency, no e- are ejected. The photoelectric effect occurs when light is shone on a metal surface and electrons are ejected. Electrons struck with higher energy light move faster once ejected. 4 principles of the photoelectric effect; which no matter how intense the light is, e- will not come off. 2_ if the light has sufficient frequency, then as light intensity (brightness) increases, the number of e- ejected also increases; (light intensity = number of photons)
