A+-+Webquest

Webquest
 * __Assignment__**

@http://www.colorado.edu/physics/2000/waves_particles/index.html

Read the answer to “What are electromagnetic waves?” Click on the “How do we know this is true?” under Albert Einstein’s picture and answer… Click on the speed of light link… 3. Why did Galileo’s experiment to figure out light speed fail? 4. What did Roemer notice about Io, a moon of Jupiter, in relation to how close the Earth and Jupiter were to each other? 5. Based on his findings, what did Roemer calculate the speed of light to be? 6. In a method similar to Galileo’s, what experiment did astronauts use to check the speed of light? Click the back button twice… Now adjust the slider to see the different wavelengths for different types of electromagnetic waves. Open another window tab and use the following to help answer the questions… http://www.metric4us.com/calculator.html 7. What is the frequency for radio and TV in meters? How many feet is that? Bonus** If light travels at 186,000 miles per second and there are 5280 feet in a mile, how many radio waves pass through a given point in one second? 8. What is the frequency of each of the following: a) microwave b) infrared light c) visible light d) ultraviolet light e) X rays f) gamma rays 9. Convert the 0.0000006 m wavelength for light into inches and write the answer.
 * 1) How do we know that these are all just electromagnetic waves with different wavelengths?
 * 2) How do we know that all the different kinds of electromagnetic waves can travel through empty space?

Now go to this address: @http://www.colorado.edu/physics/2000/microwaves/mwintro.html

Hold down the shift key and click on the “Click Here to Place Marshmallows” button. Start the microwave. 10. What do you notice about the marshmallows? 11. Why does food get hot in a microwave oven if the microwaves do not heat the air? Go to this link for additional information… @http://www.colorado.edu/physics/2000/microwaves/water_rotates.html 12. There is still a lot that hasn't been explained. Like, how does water move when placed in a microwave oven? 13. (Click Next) Does the water molecule have electric charges on it? 14. (Click Next) What happens when we increase the power of the microwave? 15. How does friction create heat when using a microwave oven? 16. Why do I still have frozen spots when I try to heat up something that is frozen in a microwave oven?

Now go to this address: @http://www.colorado.edu/physics/2000/xray/xray_abs1.html 17. Why do X rays pass through people but light does not?

Search the Internet for the answers to these questions. 18. How does radar work? 19. How do cell phones use microwaves to carry voices? 20. How do radios waves make music on a radio?