L07 Chem 111A Lecture 3: Gen Chem Week 3
11 Sep 2015
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C (speed of light) = 2. 998 * 108 c = wavelength * frequency (c = ) Investigating light"s behavior as a particle and wave. Case a: if light behaved as a particle. m/s. Case b: if light behaved as a wave (idealized/simplified versions) Young"s experiment gave evidence for the wave character of light: diffraction, superposition principle (interference) Showed energy from light can eject electrons from a metal surface which demonstrated the particle nature of light. Text on left: light of a certain color (of a certain energy) strikes the metal surface. Text of right: an electron is ejected from the metal atom with a given amount of kinetic energy. Text on right: ammeter: measures current (the amount of electrical charges passing a point in an electrical circuit per unit of time. (threshold frequency) induces a photocurrent, even at low power. Cannot be explained by wave theory. photocurrent is immediate. is not energetic enough to eject electrons.
