NATS 1745 Lecture Notes - Lecture 11: Electromagnetic Spectrum, Billiard Ball, Plum Pudding Model
20 Apr 2016
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Light is a wave. ( ) lambda;= symbol for wavelength distance from one peak to the next". Shortest wavelength= blue 400 nm, green 500 nm, red 600 nm= longest wavelength. 2. frequency (f)-number of peaks that pass in one second. Our eye responds to the different wavelengths then our brain generated color (cones in our eyes, help us decode color) 1801- two slit experiment; light behaves like waves. All parts of em travel at the speed of light c in a vacuum. All energies of light travel through an empty space at the same speed. White light gets dispersed into a spectrum through a prism. A spectrum is generated when ( white light" is sent through a prism or onto a diffraction gravity) Astronomers place gratings as part of a spectrograph at the end of the telescope to see and record the spectra of stars,nebulae and galaxies etc. A hot solid, liquid or gas at high pressure has a continuous spectrum.
