Lecture04 - The Doppler Effect Approaching sources squeeze...

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The Doppler Effect Approaching sources squeeze wavefronts together, producing a blueshift Receding sources stretch wavefronts out, producing a redshift For low speeds: The Doppler shift measures only the radial (line-of-sight) component of velocity http://www.kettering.edu/~drussell/Demos/doppler/doppler.html c v = λ λ Δ
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Light – revisited Most, but not all, aspects of light fit a wave model Early in the 20 th century, physicists realized that a particle aspect was also required Einstein – photoelectric effect – 1905 Nobel Prize particles of light are called photons photon energy: E = h f = h c / λ Planck’s constant (h): h = 6.6 x 10 -34 joule sec color is related to energy blue light has higher energy photons
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Atomic Structure Two component atom: nucleus and electrons held together by electric force structure analogous to solar system Nucleus – Sun Electrons – Planets Electric force – Gravity
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Atomic Structure (continued) Crucial difference: in atom orbits are quantized only certain orbits allowed orbit size is related to energy (like solar system) so energy is also quantized
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Atomic Structure (continued) Electrons can change energy levels
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Lecture04 - The Doppler Effect Approaching sources squeeze...

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