CHM 1311 Final: Chemistry Final Notes 2016

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The number of wave crests passing a point in space in one second. The distance between successive wave crests, measured in units of distance such as metres or nanometres. Light waves always move through empty space at the same speed. Wavelength (in units of m) multiplied by its frequency (s-1) equals its speed (m/s) Wavelength v frequency c speed spectrum. Visible spectrum of light covers the wavelength range from about 400 nm (violet) to 700 nm (red), centre is yellow light with 580 nm and a frequency around 5. 2x1014 s-1. Below a characteristic threshold frequency, v0, no electrons are observed, regardless of the intensity of the light. Above the threshold frequency, the maximum kinetic energy of ejected electrons increases linearly with the frequency of the light. Above the threshold frequency, the number of emitted electrons increases with the intensity of the light, but the kinetic energy per electron does not depend on the intensity of the light.

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