lecture3 - Which answer helps me understand where you are...

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Which answer helps me understand where you are? A.I think I understood most of it. I studied a lot of what this chapter covered in chemistry a few years ago, so I felt like a lot of it was review. However, I felt like this chapter went deeper. .. B. I think i understood the concept decently.
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A. Not really, I can see how it functions in light chromatography, but not much else. B. I found it a bit confusing since I have never really learned about it in very much depth compared to the electromagnetic spectrum. C. I thought I understood most of it, but I'm having trouble with Fig. 5.21 on page 170. .. Which answer helps me understand where you are?
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Light, the Cosmic Messenger Light is the major (almost the only) way we receive information about distant places
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“Light” includes radio waves, infrared, visible, ultraviolet, X-ray, and gamma-rays. They are all electromagnetic waves whose only difference is their wavelength. Light also displays some particle behavior. A “particle” (smallest possible unit) of light is called a photon. Fig. 5.7
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all light travels at the same speed in a vacuum: 2.99792458 x 10 8 m/sec (we'll round to 3 x 10 8 ). This is nature's fundamental conversion between space and time. speed = wavelength x frequency. Longer wavelengths have lower frequencies, and vice versa. Examples: visible: l ~5x10 -7 m, f ~6x10 14 s -1 radio: l ~1 m, f ~3x10 8 s -1 X-ray: l ~1x10 -9 m, f ~3x10 17 s -1 Energy (of a single photon) is proportional to frequency. So this X- ray photon is a billion times more energetic than the radio photon, but only 50x more energetic than the visible one. Our eyes perceive more energetic visible photons as blue, less
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This note was uploaded on 02/16/2010 for the course BIS 34957 taught by Professor Britt during the Spring '10 term at UC Davis.

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lecture3 - Which answer helps me understand where you are...

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