1. © 2010 Pearson Education, Inc. Slide 15-2 15 Traveling Waves and Sound

2. © 2010 Pearson Education, Inc. Summary Slide 15-40

3. © 2010 Pearson Education, Inc. Summary Slide 15-41

4. © 2010 Pearson Education, Inc. A particular species of spider spins a web with silk threads of density 1300 kg/m 3 and diameter 3.0 µm. A typical tension in the radial threads of such a web is 7.0 mN. If a fly lands in this web, which will reach the spider first, the sound or the wave on the web silk? Example Problem Slide 15-21

5. © 2010 Pearson Education, Inc. Sinusoidal Waves Slide 15-22

6. © 2010 Pearson Education, Inc. Checking Understanding For this sinusoidal wave: 1.What is the amplitude? A.0.5 m B.1 m C.2 m D.4 m Slide 15-23

7. © 2010 Pearson Education, Inc. Answer For this sinusoidal wave: 1.What is the amplitude? A.0.5 m B.1 m C.2 m D.4 m Slide 15-24

8. © 2010 Pearson Education, Inc. Checking Understanding For this sinusoidal wave: 2.What is the wavelength? A.0.5 m B.1 m C.2 m D.4 m Slide 15-25

9. © 2010 Pearson Education, Inc. Answer For this sinusoidal wave: 2.What is the wavelength? A.0.5 m B.1 m C.2 m D.4 m Slide 15-26

10. © 2010 Pearson Education, Inc. Checking Understanding For this sinusoidal wave: 3.What is the frequency? A.50 Hz B.100 Hz C.200 Hz D.400 Hz Slide 15-27

11. © 2010 Pearson Education, Inc. Answer For this sinusoidal wave: 3.What is the frequency? A.50 Hz B.100 Hz C.200 Hz D.400 Hz Slide 15-28

12. © 2010 Pearson Education, Inc. Sound and Light Waves The speed of sound varies with the medium. Light and other electromagnetic waves in vacuum and in air move at the same speed, 3.00 x 10 8 m/s. Slide 15-32

13. © 2010 Pearson Education, Inc. The Doppler Effect Slide 15-33

14. © 2010 Pearson Education, Inc. Energy and Intensity Slide 15-35

15. © 2010 Pearson Education, Inc. The Decibel Scale Sound intensity level is measured in decibels. Slide 15-36