Day 25: Doppler Flash

Wednesday, 18 September 2013

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This impromptu moment in class while reviewing the Doppler Effect. One of the kids wondered what would you’d hear if something moving really fast was driving toward you. I was ready for this! We watched this clip then ran the numbers for a speed just below the speed of sound.

This led to a few other realizations:

  • the Flash can’t hear anyone around him when he’s running super fast
  • you can’t hear the Flash if he’s speaking while running toward you
  • a radio transmitter as shown in the clip overcomes the problem (“cause radio waves travel so much faster than sound” said one of my kids)

(Side note: I do teach boys but they all sit on the other side of the room. My students are freshmen, so still think the other gender has cooties

 

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