Teachers, save “GSJ Experiment (Send That Signal!)” to assign it to your class.

1. Watch the video 2. Question: How could you communicate a number across the classroom without talking, writing it down, or using gestures? Possible answers include waving your hand three times or flicking the classroom lights on and off three times. Which method was the most reliable to send a signal over a very short distance? 3. Open the light sensor in the app, press the record button, flick the classroom lights on and off a few times, and stop recording. Show the resulting graph to your students. Can you count how many times the lights were turned on and off based on the graph? 4. You should see the graph go up when the lights are on and down when the lights are off. This allows you to count how many times the lights were turned on and off 5. Open the sound sensor... 6. Using NOTE or VIDEO, answer these questions: S.W.O.R.D. -- The experiment (did or did not) support the hypothesis, because...Next time, I would improve the experiment by...