There are 3 questions about light waves I don't know the answers to and i need help. Will give medal for help. They seem pretty simple but my lesson page is broke

Question

torvela · Answer

Question 1 (Multiple Choice Worth 2 points)

The distance from one point of a wave to the same point of the next wave is

torvela · Answer

Question 2 (Multiple Choice Worth 2 points)

When someone is changing a radio channel, what is being changed?

torvela · Answer

Question 3 (Multiple Choice Worth 2 points)

How is a radio wave different from a gamma wave?

dranz10 · Answer

This should help: http://imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.html

dranz10 · Answer

and this should help as well.