NATS 1870 Study Guide - Final Guide: Experimentum Crucis, Electromagnetic Spectrum, Photon
16 Oct 2011
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Describe newtons experimentum crucis" and how it fundamentally changed our understanding of colour and light. Prism red light prism = red light. Color is an intrinsic property of light. Frequency how many waves pass in a second. Gamma, x-ray, ultraviolet, visible, infrared & radio. High energy -------------------------------- low energy. Sketch a spectrum for (i) a red light and (ii) a red piece of paper. Light travels @ the speed of light. Color results from interaction between light & matter. Red (mixture of all colors) falls upon red surface. Only red wavelengths are reflected into our eye. Molecules/atoms on red surface selectively absorb certain wavelength of light, leaving only red wavelengths to be reflected. Nucleus: p & n orbited by e- The # of protons dictates the type of atom. Isotopes have more/less neutrons than the most common form. Eg. h (hydrogen) with 1p 1n 1e- Ions having more/less e- than the most common form.
