I first saw this on an episode of Curious George and had to try it!
To make our metal detector we used an portable AM/FM radio, a calculator and tape.
1. Turn the the radio to AM and turn it to the highest static station.
2. Turn on calculator and place it on the back of the radio facing out.
3. Hold them in this position near a metal object and adjust calculator until you hear a clear beeping signal.
4. Tape calculator in place.
For this investigation, I went around the house and tried to find some interesting metal objects for Thing One and Two to test the detector out on. The more solid the metal object, the better it will work.
First, I showed them how it works...But, how does it work? The calculator produces a very faint radio frequency when held near metal and the AM station actually pick up the signal for the calculator, making it loud enough for you to hear it. Pretty neat!
Thing One and Two thought so too...