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What materials will prevent radio waves from being transmitted to a receiver? My brother has a radio controlled car, and I put it in a metal box, but the controller still operated the car.
- Cassie (age 11)
Bancroft Middle School, Long Beach, California
You should be able to do this by using a box made of metal, but it
will need to be a type of metal that conducts electricity well - like
aluminum or copper. Radio waves are actually made up (in part) of small
electrical fields, so it should be possible to block them with metal if
it's conductive enough. But the metal in the box may need to be pretty
thick in order to the trick - I don't know exactly how thick, but you
should be able to experiment a bit to find out. Also, the box has to
surround the car completely - any holes (even not having the bottom
surface covered with metal) will allow the radio waves to get in.
-Tamara & Dan
(republished on 07/17/06)
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