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Unformatted text preview: McPartlin (anm464) – assignment 10 – frommhold – (58025) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 16.66 points If we continue heating a piece of initially room-temperature metal in a dark room, what will be its first visible color? 1. Red correct 2. There will be no color at all. 3. Violet 4. White Explanation: The metal glows at all temperatures, whether we see the glow or not. As its temper- ature is increased, the glow reaches the visible part of the spectrum and is visible to human eyes. Light of the lowest energy per photon is red, so the heated metal passes from infra-red (which we cannot see) to visible red. keywords: 002 16.66 points Solar radiation falls on Earth’s surface at a rate of 1100 Watts / m 2 W / m 2 . Assuming that the radiation has an average wavelength of 580 nm, how many photons per square meter per second fall on the surfaces?...
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This note was uploaded on 04/26/2009 for the course PHY 44135 taught by Professor Frommhold during the Spring '09 term at University of Texas.
- Spring '09