1 15 Traveling Waves Hk: 25, 45, 55, 79. Simple wave motion Periodic waves Waves in three dimensions Waves encountering barriers The Doppler Effect (shock waves)

Waves 2 transverse longitudinal Wave shape Propagate energy (not mass)

3 wave speed on string

4 Regular and Sinusoidal

5 watt/m 2 Intensity measures the wave propagation energy arriving per second per square meter. Example: 100W of light are directed onto a 2x2 square meter surface. The intensity is 100W/4m 2 = 25 W/m 2.

6 Reflection at more dense barrier.

7 Reflection at less dense barrier.

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9 Diffraction (width ~ wavelength)

10 Diffraction (width >> wavelength)

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12 summary wave motion intensity harmonic waves Reflection, refraction, diffraction Doppler Effect

13 Wavelength distortion due to receiver motion.

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18 periodic waves repeats with regular period T. A, max amplitude Wavelength (λ) is the distance between any point on a periodic wave and the next point corresponding to the same portion of the wave.

19 harmonic wave sinusoidal all periodic waves can be modeled by a sum of harmonic waves, e.g. fourier analysis wave number, k angular frequency, w

20 Regular and Sinusoidal

21 Intensity Level is the intensity level in dB of sound with intensity I where is defined as the minimum audible intensity intensity level is therefore comparative

22 wavelength distortion due to source motion