Science Buddies: "Ask an Expert"

for my project I am testing different materials with the same density to see which one allows radio waves to travel through them the fastest. I have researched about radio waves but I am not exactly sure how I would do this. If you could give me any tips or ideas on how to do this, or where to look for help that would be great!

I can only help you a little here. Because radio waves travel pretty much at the speed of light, you won't be able to measure which materials allow them to travel the "fastest". There are going to be differences, but they will be way too small for you to measure.

I think the question you really want to ask is, "What affect do different materials of the same density have on the strength of radio waves passing through them?"

Here's a Science Buddies experiment that should get you on your way to studying this: https://www.sciencebuddies.org/science- ... p036.shtml

Have fun!

Thank you this should really help!

Instead of using radio frequencies, you might consider using visible spectrum light waves. The speed of light (or electromagnetic waves) through different mediums is different. There is an experiment on the index of refraction that might be of interest.

This may be too late to be useful and it also may seem somewhat simple and trite, but just look it up in a materials book. Using a vacuum as a base, materials are listed for the propagation constant of an electric field as a fraction. Most insulators have values from 0.5 to 0.9. This is also related to the index of refraction.

The easy way to measure it in glass with visible light is to measure how much the light path is bent as it enters or leaves the glass and do the math.