PHYS 1061 Lecture Notes - Lecture 34: Cyan, Phosphorescence, Luminescence
Document Summary
Immediate bouncing of incident light (zero delay: very occasionally we see light that has been absorbed, then re-emitted at a different wavelength. Called fluorescence, phosphorescence, luminescence: colors, light is characterized by frequency, or more commonly, by wavelength, visible light spans from 400 nm to 700 nm. Or 0. 4 m to 0. 7 (cid:1)(cid:2)(cid:3)(cid:4)0. 0004 mm to 0. 0007 mm, etc: white light, white light is the combination of all wavelengths, with equal representation. Red hot poker has much more red than blue light. Experiment: red, green, and blue light bulbs make white. Why? because absence of green is magenta. Absence of red is cyan, etc: subtractive colors, but most things we see are not light sources, reflection takes away some of the incident light. Are these related: introduction to spectra, we can make a spectrum out of light, dissecting its constituent colors. A prism is one way to do this.
