ORIGINS 2B03 Lecture Notes - Lecture 7: Gamma Ray, Radiography
9 Feb 2012
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Document Summary
Our information about neutrinos is from a super nova which didn"t show the speed. Light is a small part of electromagnetic radiation. When the wavelength is small it is blue. We were able to detect where nuclear bombs are. Can be used to see what is inside dust. You can see the h2 in molecular clouds (where stars are born) Images get bad at x-ray, infrared and uv. Then we only take a picture in red, green and blue (individually) Then they are combined to create a big picture. So most images you see are in different wavelengths added together. The meter was defined as a length of a particular rod of metal kept under special conditions. In 1960, the meter was redefined as equal to 1,650,763. 73 wavelengths of the orange-red emission line in the electromagnetic spectrum of krypton-86 atom in a vacuum. Defined as a certain number of vibrations of a cesium atom.
