PCS 181 Lecture Notes - Electromagnetic Spectrum, Wavelength, Falsifiability
21 Mar 2013
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Starlight->tells us-> the star"s temperature, chemical composition, motio, pressure, magenetic fields etc. Light: mutually perpendicular oscillating electric and magnetic fields. Light: moves in a wavelike pattern at a speed of c=3x108 m/s (default meaning of lower case c" is speed of light) Tachyon: particles that moves faster than light (hasn"t been discovered) Lamda red= 700nm = 700x 10-9 m= 7x 10-7m ( you have to know this) Lamda violet= 400nm = 400x 10-9 m= 4x 10-7m (you have to know this) Photons: bundles of energy-> lgiths as a particle. White light-broken into dofferetn colour- different colour put together =white light. = number of wave peaks passing a given point each second. Every calculator gives different answer so on the test look for the closest answer. Note that the surface temperature of the sun is ~5800 k. E=hf h is planck constantresearch topic constant book the 6 constants. Ered = (6. 625x10-34 jxs)(4. 3 x 1014 cycles/s)"s" is in denominator.
