Wave Worksheet--Sound and Light

This is another wave worksheet, following up on the worksheet from last time.  This time we are wrapping up on our sound waves and starting to talk about light waves.  The lesson objectives are thus:

(1) review the parts of the wave (crest, trough, wavelength, amplitude, frequency)
(2) explain that light travels faster than sound, and give an example from nature (lightning/thunder)
(3) understand that, unlike sound waves, light can travel through a vacuum because it does not require a medium. 
(4) explain that white light is made up of all of the colors (learn ROY G BIV)
(5) explain simple questions on the reflective property of light. 

That's a lot for one class, but we're not going very much into detail, and I think the kids can handle it.  If not, then we'll pick up where we left off next class.

I have the following video from youtube that I'll be showing in class tomorrow:

Lightning with Thunder Delay

Below are the worksheet and answers:

The following is a visual of the worksheet: