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Electromagnetic Waves name _______________________ period ______ 1. What is an electromagnetic wave? __________________________________________________________________________________________ 2. Why can EM waves travel through space, but sound cannot? _______________________________________ __________________________________________________________________________________________ 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. __________________________________________________________________________________________ 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? __________________________________________________________________________________________ 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? __________________________________________________________________________________________ 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. __________________________________________________________________________________________ 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? __________________________________________________________________________________________ 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. __________________________________ _________________________________________________________________________________________