Using a PHET light waves stimulator: Turn only bottom light on then measure how long it takes for the center of the trough of the wave to be at that point you marked. Turn the bottom light off and allow the waves to dissipate. Next, turn on the light at the top and allow the simulation to run for exactly the amount of time measured. Record the “state of the wave” at your marked point. Is it a trough, a crest, or in between? Record your answer.
Question: Why is it important that waves travel for the same amount of time in steps 3 and 5?
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