Today was the first day of the 4th marking period. We spent today discussing section 9-3 notes on the different wave interactions, including reflection, diffraction, refraction and interference. I drew the diagram of the law of reflection on the board and bounced a tennis ball off of it to demonstrate how reflection works. I used a pencil in a glass of water to demonstrate refraction. For diffraction, we used a giant slinky to demonstrate how waves bend around a barrier (or student), and we also used it to show how interference works. I also nice little LED strobe toy that demonstrated standing waves- students really seemed to enjoy it. Students were assigned worksheet 9-9 to do within their groups for 10 minutes, and we went over the answers before the end of the period. Students were given their final 3rd quarter grades and a new seating chart at the end of class.
News article #27 is due on Monday, and the Chapter 9 test is on Wednesday, April 6th.
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