Reflection: Checks for Understanding Slinky Rules - Section 5: Wave Interference Debrief and Exit Quiz


Overall, the student responses are reasonable and accurate. Two waves on one side results in a bigger wave and two waves on opposite sides result in a canceled or partially canceled wave (Wave Behavior Activity - Student Work). However, many groups did struggle with getting the width of the wave. They drew the interference far wider that the original wave. I think in the future, I will add a grid to this document and instruct students to imagine the grid to correspond to the tiles on the floor. 

Another issue was the reflection activity. The original paper had the students drawing the reflected wave on the same graph whereas all the other waves were on line below the original waves. This confused many groups so I changed the wave reflection part of the Wave Behavior Activity sheet so that students would picture the reflected wave below the original wave like the rest of the examples. 


  Checks for Understanding: student work reflection
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Slinky Rules

Unit 5: Waves
Lesson 2 of 15

Objective: Students use double-length slinkys and slow motion video to determine how waves interact with each other and with a fixed barrier.

Big Idea: When multiple waves interact, their amplitudes add together; this is called wave interference.

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