YSI 1995 / Reporting Groups / Light Waves

Students: Thomas Reid, Rukiya Wheeler, Trameka Robinson

Light Waves

by Thomas Reid, Rukiya Wheeler, Trameka Robinson

```I.  Introduction
A.  Introduce Yourself
B.  Introduce Group Members
C.  Introduce Topic

A.  Different forms of light waves
B.  Different part of light waves
C. Construct a brief drawing of a light wave

III.  Spectrometer
A.  Explain purchase of spectrometer
B.  Explain various colors of spectrum and its relationship to
light waves.
C.  Show audience spectrometer and demonstration
D.  Cardboard diagram

IV.  Introduction of transmitter
A.  Tell the purpose of a transmitter
B.  Put transmittter into action
C.  Identify different parts of transmitter

V.  Closing
A.  Opinion of project
B.  Any questions
```

Report

There are various forms of waves that you cannot see suh as X-rays, Gamma rays, and inferred waves. These waves are not visible to the human eye because the rays are not in our visible light range. This makes them hard to see.

There are also waves that are visible to the human eye. light waves are visible and are made up of many colors. The reason why is because of the wave line. This process is called in phase. It is when two or more waves are in phase they expand and give off white light. When two or more waves are out of phase they cancel out and give off darkness.

A great example is on the board. You have a classic wave. The highest point of the wave is called a peak, the lowest point is called a trough, and the height of the wave is called amplitude. Different parts of the wave have different degrees. When a wave is 180 degrees out of phase, the wave will destruct and cancel out to give off darkness, but when the wake is 90 degrees in phase it will construct and give off white light.

Spectrometers

A spectrometer (or spectrograph) is a device with wich the spectrum of any light source can be photographed or recorded. A spectrum can be attached to a telescope and used to record the spectrum of the light from a particular star.

What actually happens when you use a spectrometer is that light enters the spectrograph through a narrow slit and then is collimated (made into a beam of parallel rays) by a lens. Different wave lengths of light then leave the prism (or grating) in different directions due to dispersion on deffraction. A second lens placed behind the prism then forms an image of the spectrum on the photo graphic plate due to dispersion, the light of different wave lengths enter the second lens from slightly different directions and consequently the lens produces different images of the slit for each different wavelength.

Rukiya Wheeler

Hello my name is Rukiya Wheeler. I am here to introduce you to the transmitter. First what is the purpose of an transmitter. Well, my class played a game called transmitter hunt and we had to find the transmitter hunt and we had to find the transmitter. The radio was our guide. Since radio waves bounce off of everything in town, we used an Attenuater. An attenuater is a tube of cardboard covered with aluminum foil to block out the rest of the radio waves that would interfere. We put the Attenuater over the antenna of the radio. Plus we had to hold the Attenuater close to our bodies to find the weakest signal. That means that the transmitter is behind us. Only a few classes found it. To bad I didn't. Although the game is fun, it is also tricky.

Summary

Over the past week Mr. Dreiser and Mr. Knox has worked with different students to learn many things. We gathered all of the things together that we have learned to form this research paper.

We have briefly informed you what we've learned about lightwaves, spectrometers, and transmitters. It turned out to be a great learning experience and very exciting. We hope to have this experience again.

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