1.  As we go through these slides, you will make a study dictionary of some of your vocabulary words.  For each word you will draw a picture to help you visualize what it means.  Vocabulary words: reflection, angle of incidence, angle of reflection, refraction, diffraction, interference, constructive interference, destructive interference, standing wave, nodes, antinodes, resonance, seismic waves, primary waves, secondary waves, surface waves, and seismographs

4. Wide gap = small diffractio n effect Narrow gap = large diffraction effect Large wavelength = large diffraction effect DIFFRACTION

5. CONSTRUCTIVE INTERFERANCE  Helping each other  2 waves combine to make a LARGER amplitude DESTRUCTIVE INTERFERANCE Destruct = destroy 2 waves combine to make a SMALLER amplitude

6.  When an incoming wave and reflected wave combine at a specific place, the wave APPEARS to be standing still.  In reality, the waves are just passing through each other.

8.  Yesterday we watched water in the bucket continue to vibrate long after the disturbance was over. This is an example of resonance.  Examples: Pushing someone in a swing, jumping rope, rolling a bowling ball back and forth with someone