Light and Dark (Part 1: Light) - A BBC News Documentary 

What were the properties of light that were discussed in the documentary? Explain each property.

Describe the properties of visible light.

I would be really thankful if you show me how to solve question APO7 in this document. Thank you!
http://www.shs.d211.org/physicsd211/studyguides/light/APLight/APOPacket.pdf

Compare the properties of water to the properties of the elementsit contains?
I'm not sure how to answer this question?
Please help me?