CHEM 1A Lecture Notes - Lecture 14: Black-Body Radiation, Blood Orange, Shortwave Radio
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CHEM 1A Full Course Notes
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It was later discovered that light is both a wave and a particle. V (nu) = frequency (s-1) = # cycles per second. It glows red orange yellow white. Light is emitted in packets of energy called photons. Energy of each photon: e = hv. Since c = v, v = c/ . H = planck"s constant, 6. 626 10-34 j s. When light has high enough frequency, electrons can be ejected from metal by light. Vo is minimum frequency needed to eject e- The energy required to remove electrons from the surface of rubidium is 208. 4 kj/mol. V = (2. 998 108 m/s)/(0. 000000254 m) = 1. 18 1015 hz. Keelectron = (6. 626 10-34 j s)(1. 18 1015 hz) - (6. 626 . 10-34 j s)(208400 j) = 4. 36 10-19 j. Light is both a particle and a wave. All matter is also both a particle and a wave.
