1. © 2010 Pearson Education, Inc. Slide 25-2 25 Electromagnetic Induction and Electromagnetic Waves

2. © 2010 Pearson Education, Inc. Slide 25-4

3. © 2010 Pearson Education, Inc. Induced Current in a Circuit Slide 25-13

4. © 2010 Pearson Education, Inc. Eddy Currents Slide 25-35

5. © 2010 Pearson Education, Inc. A changing magnetic field induces an electric field. A changing electric field induces a magnetic field too. Induced Fields Slide 25-38

6. © 2010 Pearson Education, Inc. Electromagnetic Waves Slide 25-39

7. © 2010 Pearson Education, Inc. Intensity of an Electromagnetic Wave Slide 25-42

8. © 2010 Pearson Education, Inc. Polarization Slide 25-44

9. © 2010 Pearson Education, Inc. Light passed through a polarizing filter has an intensity of 2.0 W/m 2. How should a second polarizing filter be arranged to decrease the intensity to 1.0 W/m 2 ? Example Problem Slide 25-45

10. © 2010 Pearson Education, Inc. The Electromagnetic Spectrum Slide 25-46

11. © 2010 Pearson Education, Inc. The Photon Model of Electromagnetic Waves Slide 25-47

12. © 2010 Pearson Education, Inc. Thermal Emission Spectrum Slide 25-50

13. © 2010 Pearson Education, Inc. Hunting with Thermal Radiation Slide 25-51

14. © 2010 Pearson Education, Inc. Seeing the Universe in a Different Light Slide 25-52

15. © 2010 Pearson Education, Inc. Summary Slide 25-54

16. © 2010 Pearson Education, Inc. 3.Comparing infrared and ultraviolet, we can say that A. infrared has longer wavelength and higher photon energy. B. infrared has longer wavelength and lower photon energy. C. ultraviolet has longer wavelength and higher photon energy. D.ultraviolet has longer wavelength and lower photon energy. Reading Quiz Slide 25-9

17. © 2010 Pearson Education, Inc. Answer 3.Comparing infrared and ultraviolet, we can say that A. infrared has longer wavelength and higher photon energy. B. infrared has longer wavelength and lower photon energy. C. ultraviolet has longer wavelength and higher photon energy. D.ultraviolet has longer wavelength and lower photon energy. Slide 25-10

18. © 2010 Pearson Education, Inc. Example Problems A gamma ray has a frequency of 2.4 X 10 20 Hz. What is the energy of an individual photon? A typical digital cell phone emits radio waves with a frequency of 1.9 GHz. What is the wavelength, and what is the energy of individual photons? If the phone emits 0.60 W, how many photons are emitted each second? Slide 25-48