1. Jeopardy Jeopardy PHY101 Chapter 8 Review Study of EM Waves Cheryl Dellai

2. Study of EM Waves Magnetism Interactions EM Waves EM Spectrum Atmosphere Potpourri $100 $200 $300 $400

3. Magnetism $100 Like poles (repel/attract). ANSWER

4. Magnetism $200 Magnetic field of the Earth on average.

5. ANSWER Magnetism $300 Magnetic field at Phoenix.

6. ANSWER Magnetism $400 What is the magnetic field force equation?

7. Interactions $100 ANSWER What can change in the magnetic flux?

8. ANSWER What is Faraday's Law? Interactions $200

9. ANSWER Interactions $300 What is Ampere-Maxwell's Law?

10. Interactions $400 ANSWER What is Lenz’s Law?

11. EM Waves $100 ANSWER How are EM waves created?

12. EM Waves $200 ANSWER A radio transmitter broadcasts at a frequency of 200,000 Hz. What is the wavelength of the wave?

13. EM Waves $300 ANSWER What is the wavelength of the peak of the blackbody radiation curve for something at 3,000 K—the temperature of the filament of a light bulb? What type of EM wave is this?

14. EM Waves $400 ANSWER About how hot does something have to get to glow red hot?

15. EM Spectrum $100 ANSWER The cosmic background radiation has _____.

16. EM Spectrum $200 ANSWER The main form of radiation that our bodies emit is __________.

17. EM Spectrum $300 ANSWER __________ radiation is emitted from a small hole in a furnace.

18. EM Spectrum $400 ANSWER The total radiant power emitted by a blackbody is proportional to its __________ raised to the fourth power.

19. Atmosphere $100 ANSWER The ionosphere reflects __________ frequency radio waves.

20. Atmosphere $200 ANSWER The ozone layer absorbs __________ radiation from sunlight.

21. Atmosphere $300 ANSWER The greenhouse effect occurs because carbon dioxide in the atmosphere absorbs __________ radiation.

22. Atmosphere $400 ANSWER The increase in the amount of carbon dioxide in the atmosphere is responsible for __________.

23. Potpourri $100 ANSWER Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do. (True/False)

24. Potpourri $200 ANSWER __________ are emitted when high speed electrons decelerate as they are smashed into a metal target.

25. Potpourri $300 ANSWER TV remote controls use __________ radiation.

26. Potpourri $400 ANSWER A superconductor expels any magnetic field from its interior. This is called __________.

27. Magnetism $100 Answer Back to Jeopardy Like poles (repel/attract). Repel

28. Magnetism $200 Answer Back to Jeopardy Magnetic field of the Earth on average 1 gauss or 100 µT SI unit is Tesla = T

29. Magnetism $300 Answer Back to Jeopardy Magnetic field at Phoenix. 1/2 gauss or 50 µT

30. Magnetism $400 Answer Back to Jeopardy What is the magnetic field force equation? F =qvB = ILB Where v & B are perpendicular XXXXXXXX

31. Interactions $100 Answer Back to Jeopardy What can change in the magnetic flux? The Magnetic Field The Area The angle

32. Interactions $200 Answer Back to Jeopardy What is Faraday's Law? A changing Magnetic Flux will create a changing Electric Field that opposes the change.

33. Interactions $300 Answer Back to Jeopardy What is Ampere-Maxwell's Law? A changing Electric Flux will create a changing Magnetic Field that opposes the change. A current will create a Magnetic Field..

34. Interactions $400 Answer Back to Jeopardy What is Lenz’s Law? The induced EMF opposes the change that caused it.

35. EM Waves $100 Answer Back to Jeopardy How are EM waves created? They are created by accelerating charges.

36. EM Waves $200 Answer Back to Jeopardy A radio transmitter broadcasts at a frequency of 200,000 Hz. What is the wavelength of the wave? =c/f = 1,500 m

37. EM Waves $300 Answer Back to Jeopardy What is the wavelength of the peak of the blackbody radiation curve for something at 3,000 K—the temperature of the filament of a light bulb? What type of EM wave is this? ¬ max in meters = 0.0029/T in K) 9.67*E  10 -7 m = 967 nm, infrared

38. EM Waves $400 Answer Back to Jeopardy About how hot does something have to get to glow red hot? T = 0.0029/ ¬ = 4265K = 3992 O C = 7153 O F Red = 680 nm PEAK AT RED Objects cooler than 700K (800 O F) appear red because we can not see into the infrared.

39. EM Spectrum $100 Answer Back to Jeopardy The cosmic background radiation has _. has a blackbody spectrum.has its peak emission in the microwave band. corresponds to a blackbody at a temperature of 2.726 Ks.

40. EM Spectrum $200 Answer Back to Jeopardy The main form of radiation that our bodies emit is infrared.

41. EM Spectrum $300 Answer Back to Jeopardy Blackbody radiation is emitted from a small hole in a furnace.

42. EM Spectrum $400 Answer Back to Jeopardy The total radiant power emitted by a blackbody is proportional to its temperature raised to the fourth power. Power =  AT 4

43. Atmosphere $100 Answer Back to Jeopardy The ionosphere reflects low (AM) frequency radio waves.

44. Atmosphere $200 Answer Back to Jeopardy The ozone layer absorbs ultraviolet radiation from sunlight.

45. Atmosphere $300 Answer Back to Jeopardy The greenhouse effect occurs because carbon dioxide in the atmosphere absorbs infrared radiation.

46. Atmosphere $400 Answer Back to Jeopardy The increase in the amount of carbon dioxide in the atmosphere is responsible for global warming, the greenhouse effect.

47. Potpourri $100 Answer Back to Jeopardy Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do. (True)

48. Potpourri $200 Answer Back to Jeopardy X-rays are emitted when high speed electrons decelerate as they are smashed into a metal target.

49. Potpourri $300 Answer Back to Jeopardy TV remote controls use infrared radiation.

50. Potpourri $400 Answer Back to Jeopardy A superconductor expels any magnetic field from its interior. This is called the Meissner effect.

51. Thank You for playing Study of EM Waves Jeopardy!