1. Ch. 18 - Waves & Sound I. Characteristics of Waves  Waves  Transverse waves  Longitudinal waves  Measuring waves

2. A. Waves  Waves  rhythmic disturbances that carry energy through matter or space  Medium  material through which a wave transfers energy  solid, liquid, gas, or combination  electromagnetic waves don’t need a medium (e.g. visible light)

3. A. Waves  Two Types: Longitudinal Transverse

4. B. Transverse Waves  Transverse Waves  medium moves perpendicular to the direction of wave motion http://www.cbu.edu/~jvarrian/applets/waves1/lontra_g.htm Animation

5. B. Transverse Waves  Wave Anatomy crest troughs wavelength amplitude corresponds to the amount of energy carried by the wave nodes

6. C. Longitudinal Waves  Longitudinal Waves (a.k.a. compressional)  medium moves in the same direction as wave motion http://www.cbu.edu/~jvarrian/applets/waves1/lontra_g.htm Animation

7. C. Longitudinal Waves  Wave Anatomy rarefaction compression wavelength Amount of compression corresponds to amount of energy  AMPLITUDE.

8. D. Measuring Waves  Frequency ( f )  # of waves passing a point in 1 second  Hertz (Hz)  shorter wavelength  higher frequency  higher energy 1 second

9. D. Measuring Waves  Velocity ( v )  speed of a wave as it moves forward  depends on wave type and medium v = × f v:velocity (m/s) :wavelength (m) f:frequency (Hz)

10. WORK: v = × f v = (3.2 m)(0.60 Hz) v = 1.92 m/s D. Measuring Waves  EX: Find the velocity of a wave in a wave pool if its wavelength is 3.2 m and its frequency is 0.60 Hz. GIVEN: v = ? = 3.2 m f = 0.60 Hz v f

11. WORK: f = v ÷ f = (5000 m/s) ÷ (417 m) f = 12 Hz D. Measuring Waves  EX: An earthquake produces a wave that has a wavelength of 417 m and travels at 5000 m/s. What is its frequency? GIVEN: = 417 m v = 5000 m/s f = ? v f

13. Read, Reread Sample Problem A: A tuning fork has a frequency of 280 hertz, and the wavelength of the sound produced is 1.5 meters. What is the velocity of the wave? A. 420 m/s B. 210 m/s C. 65 m/s D. 187 m/s Underline Bracket IdentifyEliminate, Solve, Select VariablesFormulaTriangleSet Up and Plug InAnswer Problem Solving with Rubies

14.  http://www.nisd.net/communicationsarts/pages/i pc/ppt/wavechar_pres.ppt http://www.nisd.net/communicationsarts/pages/i pc/ppt/wavechar_pres.ppt http://paws.kettering.edu/~drussell/Demos/waves/wavemotion.html Additional Animation Sites