13 Reverse ear headphones
Cost: $1.00 ~$10.00 Difficulty: Low Time: Hour Continuous: No
Summary:
Make a pair of reverse headphones that makes it difficult to tell what direction sound is coming from. The cost of this project varies from no cost if you used recycled materials or used store bought materials.
ELO’s – Describe how sound travels through Different Media. Vibration and sound relationship, observation, testing & exploration, discussion, building a hypothesis, critical thinking.
Supplies needed: Funnels, plastic flexible tubing, tape.
Free supplies: roll paper to make funnels or use empty paper cups or plastic bottles, flexible tubing or hose, a little bit of tape.
Inexpensive supplies: cheap plastic funnels or store bought disposable cups, plastic tubing from dollar store or Walmart, tape.
Expensive: If you go into an auto parts store for funnels and hoses/tubing, expect to spend a lot.
Activity
Warning: Do not yell into the funnel when someone is using! The wearer may suffer permanent ear damage.
1) Take two cups or plastic funnels or make two cones out of paper by rolling it up Use tape to secure the shape.
2) Tape a funnel or cone to each end of your plastic flexible tubes and tape one cone to an end of the tube.
3) Create two of these
4) Lay one over the other in an X shape, and tape them where they cross
Again Warning: Please tell your students, “do not yell into funnel (cone) when someone is using! Wearer may suffer permanent ear damage.”
Discussion:
Have the student wearing the device sit down in a chair and then close their eyes. A second student will stand somewhere around the room, preferably behind the student to prevent peaking. When the student hears a sound, they should say, left or right. Also let the student hear several different kinds of sounds to see if they can identify what it is. You left ear and right ear can sometimes hear different pitches and sounds: such as voices, animal sounds, or other noises.