This online text is good for learning about EM waves: http://www.ducksters.com/science/physics/types_of_electromagnetic_waves.php
However, to understand Spooky, it would be better to learn about harmonics. This is explained very well at http://www.physicsclassroom.com/Class/sound/u11l2a.cfm. The course is covered in several pages, and starts from the very basics.
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