THE ELECTROMAGNETIC SPECTRUM Penetrates Earth N N Atmosphere? Wavelength (meters) Radio Microwave Infrared Visible Ultraviolet X-ray Gamma Ray 103 10-2 105 ,5×106 108 1010 1012 About the size of... A∧WMM Buildings Humans Honey Bee Pinpoint Protozoans Molecules Atoms Atomic Nuclei Frequency (Hz) 104 108 1012 1015 1016 1018 1020 Temperature of bodies emitting the wavelength 0 1K 100K 10,000K 10 Million K Examples:http://imagers.gsfc.nasa.gov/ems/ems.html 3.012 Fundamentals of Materials Science:Bonding-Nicola Marzari (MIT,Fall 2005)