Click on the Science button, then Physical Science, then Light and Sound
Click on Elementary level, then enter the search terms: light (physics) and sound (physics).
Click World Book Kids, then type in the search terms: light, and sound where it says search.
Enter your search terms, then you can limit your results on the right by the format on the right (article, image, magazine, etc.)
Click on the "Booklists" icon on the top of the page, then select the "Light and Sound" book list.
Lightbox books can be found on FollettShelf and the Brytewave app under interactive eBooks from the Collections tab. Look for the titles Hearing and Sight. If you are in Brytewave, it will open up another link in FollettShelf, and then LightBox.