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PROPRIETARY MATERIAL . 2008 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission. 15-1 Solutions Manual for Introduction to Thermodynamics and Heat Transfer Yunus A. Cengel 2 nd Edition, 2008 Chapter 15 RADIATION HEAT TRANSFER PROPRIETARY AND CONFIDENTIAL This Manual is the proprietary property of The McGraw-Hill Companies, Inc. (McGraw-Hill) and protected by copyright and other state and federal laws. By opening and using this Manual the user agrees to the following restrictions, and if the recipient does not agree to these restrictions, the Manual should be promptly returned unopened to McGraw-Hill: This Manual is being provided only to authorized professors and instructors for use in preparing for the classes using the affiliated textbook. No other use or distribution of this Manual is permitted. This Manual may not be sold and may not be distributed to or used by any student or other third party. No part of this Manual may be reproduced, displayed or distributed in any form or by any means, electronic or otherwise, without the prior written permission of McGraw-Hill. PROPRIETARY MATERIAL . 2008 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission. 15-2 Electromagnetic and Thermal Radiation 15-1C Electromagnetic waves are caused by accelerated charges or changing electric currents giving rise to electric and magnetic fields. Sound waves are caused by disturbances. Electromagnetic waves can travel in vacuum, sound waves cannot. 15-2C Electromagnetic waves are characterized by their frequency v and wavelength . These two properties in a medium are related by v c / = where c is the speed of light in that medium. 15-3C Visible light is a kind of electromagnetic wave whose wavelength is between 0.40 and 0.76 m. It differs from the other forms of electromagnetic radiation in that it triggers the sensation of seeing in the human eye. 15-4C Infrared radiation lies between 0.76 and 100 m whereas ultraviolet radiation lies between the wavelengths 0.01 and 0.40 m. The human body does not emit any radiation in the ultraviolet region since bodies at room temperature emit radiation in the infrared region only. 15-5C Thermal radiation is the radiation emitted as a result of vibrational and rotational motions of molecules, atoms and electrons of a substance, and it extends from about 0.1 to 100 m in wavelength. Unlike the other forms of electromagnetic radiation, thermal radiation is emitted by bodies because of their temperature. ... View Full Document

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