# Science Fair

## Background

Stealth technology is not just one technology, but a lot of methods that decrease the distance that a vehicle can be detected by radar, sonar or other means.

Radar is a detection system that tracks the location, speed, and direction of a vehicle by sending out short bursts of radio waves, and then listening for an echo as the waves bounce off the vehicle. By measuring how long it takes for an echo to arrive back, and how much of a shift has occurred in the echo as compared to the transmitted signal, the distance to the vehicle, and its velocity can be tracked.

One way an aircraft is made more stealthy is by reducing its radar cross section or the radar signature that an aircraft produces. Radar cross section is a measure of how detectable an aircraft is by radar.

## Purpose

The purpose of this experiment is to find out which objects scatter the most light in such a way that they would become invisible to radar. The military uses the stealth objects as fighter planes and ships.

## Hypothesis

The cylinder will scatter the least amount of light because of its smooth texture and it’s shape therefore making it invisible to radar.

## Materials

Cardboard box
Lux Ray/light meter
Led flashlight
Black construction paper
Notebook
Pen or pencil
Graph paper
Copy paper
Packing tape
Duct tape

## Procedure

Get all materials
Cut the construction paper to the right size
Tape the paper to the inside of the box
With the copy paper, make a cylinder a crumpled cylinder a v and a w.
Tape the flashlight to the inside of the box
Put the first shape in the box and close with the light meter inside the box.
Record the data
Repeat for every shape 3-4 times
Graph data

## Observations

I noticed when I was testing the objects that there was very noticeable difference between every shape. From what I could tell without looking directly at the data was the cylinder and the W were by far the most different in the way they scattered the light.

## Conclusion

My hypothesis was supported in the fact that the cylinder scattered the least and the W scattered the most.

## Sources of error

The shapes not being in the same exact spot in the box every time could have slightly altered the results. The light meter may not be 100% accurate every time because it wasn’t professional quality.