Reliable World Wide Websites
Wikilectures - a project focused on creating and storing medical study materials. Developed for students and teachers of all medical faculties.
MedlinePlus
LiveScience
NASA - Electromagnetic Spectrum -Old NASA site but still accurate info
Electromagnetic Spectrum - Study prep site for the UK college entrance exams. Basic and simple info. Helpful as a starting place if nowhere else worked.
Gamma Rays - NBC News
X-Rays - National Institute of Health
Visible Light - BEMRI Scientific Community Research Portal (using visible light communications)