Thursday, Feb 7, 2008 - 4B

Collected RA 11.2b
Handed back and went over RA 11.2a
Collected redos for a reduced grade after we went over the worksheet

Wave properties
Reflection - show in mirror, echoes (both light and sound)
Refraction - demonstrate with students walking in a line, show with laser in water (both light and sound)
Diffraction - we can hear around corners (longer wavelength sound) but can't see around corners (shorter wavelength light). The longer the wavelength, the greater the bending around corners. (both light and sound)
Polarization - model with cord and picket fence - only transverse waves can be polarized. Show polarizers, LCD from calculators and some cell phones are polarized.
(light only, sound cannot be polarized)
Doppler Effect - demonstrated with tuning fork on string (both light and sound)

Speed of waves - hand out worksheet - went over problem solving strategy - finish for homework due Monday

Venn Diagram exercise with light and sound
Gave students time in class to work on Waves worksheet

Test on waves Wednesday, Feb 13