This is the link to the slideshow that we used for the Electromagnetic spectrum today.  Make sure you're comfortable with all the dot points on the last slide!
https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0BzFUvVu_WNI_M2VjYzcxMmEtMjc4Ni00ODViLTgxNjYtN2YzYzY5ZjQyMmU2&authkey=CKfvz8AM&hl=en