Sound and light waves

Today we're going to keep looking at sound waves, and start to look at how light waves work too. Answer the following in your books:

1. What is the approximate range of human hearing? Remember to include units.
2. What is one difference between sound and light waves?
3. Explain what separates the different parts of the electromagnetic spectrum. The image below may help:                                                                          
4. How are microwaves used in comunication?
5. Define diffraction, and give one real life situation where it occurs.
6. What two things influence the amount of diffraction?
7. Watch this video, showing a non-newtonian fluid on top of a speaker. What type of sound waves seem to have the greatest effect on the fluid? Try to use scientific terms from class in your answer.
8. How is the normal line drawn in relation to this mirror? Can you give the law of reflection?
9. How are relfection and refraction different? Think about the angles you have seen today: 
10. Extension - Why is refraction important for you to see things? Use the image below to help you: