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Lux et Veritas

Lux et Veritas. Radiation, which is the motion of the electromagnetic field, of which visible light is a small region, is due to the motion of charges  Move a charge = radiate. C= λ f = 3x10^8 m/s.

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Lux et Veritas

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  1. Lux et Veritas

  2. Radiation, which is the motion of the electromagnetic field, of which visible light is a small region, is due to the motion of charges  Move a charge = radiate

  3. C= λ f = 3x10^8 m/s

  4. CMB@3K, not owl poop, everywhere in space, this is exaggerated by a large factor (of like 10,000K) = almost the big bang…more later in the term

  5. Energy/momentum • E = h f h = planck’s constant = 6.63 X 10^(-34) (J*s) • P = momentum = E/c c= speed of light • E/B=c where E,B are field magnitudes

  6. C (first method) • a microwave oven,a bag of marshmallows, and a ruler. • (The oven must be of the type that has no mechanical motion-no turntable or rotating mirror. If there is a turn-table, remove it first.) • cover dish with a layer one marshmallow thick. • cook on low heat. • Heat the marshmallows until they begin to melt in four or five different spots. • measure the distance between the melted spots. You will find that one distance repeats over and over. This distance will correspond to half the wavelength of the microwave, about 6 cm. • Now turn the oven around and look for a small sign that gives you the frequency of the microwave. Most commercial microwaves operate at 2450 MHz. • Velocity = Frequency X Wavelength

  7. C (second method)

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