Download Electromagnetic Waves

Electromagnetic Waves
name _______________________
period ______
1. What is an electromagnetic wave?
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2. Why can EM waves travel through space, but sound cannot? _______________________________________
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3. Draw a picture of an excited atom as the electron returns to a lower level and gives off light.
4. How do atoms become “excited”? ____________________________________________________________
5. Who proposed that light was both a wave and a particle? ____________________________
6. What is the evidence that light is a particle?
__________________________________________________________________________________________
7. What is the name for the light particle? _____________________
8. What is the speed of light in space. __________________________________
9. T or F. Light always travels at the same speed.
10. What is refraction? _______________________________________
11. Why does refraction happen? _____________________________________________________
12. Write the saying which helps to remember the order for the different types of EM from longest wavelength
to shortest wavelength.
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13. How long might be the wavelength of an AM radio wave? __________________
14. Which has a longer wavelength, AM or FM radio? _______________
15. What does AM stand for? _____________________________________________
16. Why can you hear distant AM stations at night, but not distant FM stations?
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17. What does FM stand for? ____________________________________________
18. How does television send its video signal? ________________ audio signal? ________________
19. What types of communication use microwaves? ________________________________________________
20. How are microwave ovens able to heat food? __________________________________________________
21. T or F. A cell phone microwaves can heat up parts of your brain.
22. T or F. All objects give off IR.
23. How do pit viper snakes get their name?
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24. List 2 uses for IR: __________________________________ _______________________________
25. Give the name used to remember the colors of light in order from longest wavelength to shortest
wavelength. ___________________________________
26. List the colors of the visible spectrum.
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27. Which wavelengths bend the most during refraction? long wavelengths
short wavelengths
28. What happens to white light when the light passes through a prism?
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30. What can Ionizing Radiation do to electrons? __________________________________________________
31. Which type of EM is ionizing? Visible light and below
Above visible light
32. Why aren’t radio waves a cancer risk? _______________________________________________________
33. What bad things happen when DNA is damaged? _______________________________________________
34. How do bees find the center of some flowers using UV? _________________________________________
35. What happens to DNA of skin cells, when the skin is exposed to UV radiation?
__________________________________________________________________________________________
36. What is melanin? ________________________________________________________________________
37. What causes cells to make more melanin? ____________________________________________________
38. Why do bones show up on X-rays? __________________________________________________________
39. T or F. X-rays can cause cancer.
40. T or F. X-rays can cure cancer.
41. How are gamma rays produced? ____________________________________________________________
42. List 2 helpful uses for gamma rays. _______________________________ __________________________
43. What is fallout? _________________________________________________________________________
44. Explain why fallout shelters are buildings with very thick walls. __________________________________
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