Radar

Radar enables us to know what something looks like withoug being able to see it. But how does it work?

Materials

• Box
• Paper (enough to cover box)
• Random object (small enough to stick in box
• Ruler

Procedure

1. Place your object in the box and cover the box with paper.
2. Make a color code corresponding to different distances - for example, one inch might be light green, two might be dark green, and so on.
3. Systematically poke the stick through the paper, record how far in the stick goes before it hits something, and mark the hole with its corresponding color
4. Once you've covered nearly the entire area, fill in the rest of the paper with the colors around it. This forms your rough topographical map of what is inside, and should give you a good idea of what is inside the box.

This is how radar works: by measuring the distance between the observer and the object by sending out radar and "listening" for the the amount of time it takes for a given wave to echo, we can determine how far away the object is, and even draw maps of the target.