1. A wave is a wave is a wave !

2.  Waves  They are an everyday part of our life Hear & See  Anatomy of a wave Cycle – from peak to peak Period - # of sec. / cycle Frequency – Number of cycles / sec.

3.  More Anatomy of a wave  Crest  Trough  Wavelength (cycle)

4.  Fact: In a wave the medium DOES NOT move  A wave is a transfer of energy  A floating ball on the lake  The Poseidon Adventure – the movie  Wave types  Longitudinal (L-wave) Matter movement in the same direction as the wave  Transverse (T-wave) Matter movement that is perpendicular to the direction of the wave

5.  Wave Medium Travel Gas L-wave = Yes, T-wave = No Liquid L-wave = Yes, T-wave = No Solid L-wave = Yes, T-wave = Yes  A 3 rd type of wave  S-wave (surface wave)

6.  Sound Waves  A medium must be present !!!!! Something must carry the energy What about the Moon????  What can the human ear hear?  We hear L-waves only 20 – 20,000 Hz  Velocity of sound 1,087 ft/sec. or 741.13 m/h (@ 0 degrees C)

7.  Waves reflect & refract  Echo.10 sec.  Application Sonar Radar “Speed Traps”  Moving Sound  Doppler Effect A change in wave length due to movement Change in frequency Application Radar gun Astronomy