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Scientific Method Experiment

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Miranda Fuchs

on 31 May 2011

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Transcript of Scientific Method Experiment

suNGLASSES In Space By Megan Swan, Miranda Fuchs, Claire Hall, Audrey Walts, and Chynna Fry Objective/Problem When wearing sunglasses, What kind of lens offers the most protection? RESEARCH Types of UV UVA UVB UVC The UVC rays have the shortest wavelength and the most energy, but they fortunately do not penetrate the atmosphere because they are blocked by oxygen. UVB rays have a shorter wavelength than UVA rays, and they only reach the surface of the body, but They are still harmful to skin and EYES. There are 3 types of UV light allaboutvision.com
-UV light
-lense Hypothesis Experiment Observe and Analyze Conclusion Sunglasses that have a lens of darker tint will block more UV rays, and brown is the best color at blocking radiation.

As the altitude increases, the UV absorbtion should also increase. This is because, at higher altitudes it is closer to the sun. Also, at higher altitudes, there is not as much blockage from clouds and other substances of the atmosphere. Chynna Miranda Fuchs and Megan Swan By Claire Brown, gray and green lenses are color-neutral, which means they cut down on overall brightness without distorting colors Yellow, gold and amber lenses provide less overall brightness protection, but they enhance contrasts in tricky, flat-light conditions. Lense types: Color Sources. Part of our hypothesis was correct, however, we found a few things that were interesting. We found it interesting that altitude had no evident correlation with UV absorbtion. Thus UVC rays will have no effect on the weather balloon experiment. UVA rays are not absorbed by the atmosphere, so completely reach Earth. UVA damage reaches deep in the body, and so is responsible for most of the vision problems, such as cateracts (which is the main cause for blindness), because it can penetrate through the retina. Research (Continued) Lense types: Material Glass lenses block more UV than the other materials commonly used for lenses. Cheap sunglass lenses with no UV protection can even harm the eye, because the dark tint causes the irises to open, letting in more UV radiation into the eye. Our hypothesis was correct. Darker lens ABSORB MORE LIGHT ABSORB lighter lens 1. Identify variables.
2. Gather five different lenses, provided
by Dr. Diedrich.
3. Attatch lenses securely over UV sensors
on pod. LESS 80% Sahara
80% Grey
80% Green
50% Sahara
20% Sahara This behavior of UV light is SIMILAR to that of visible light, where darker colors absorb the most. Color intensity (shade)
Color (tint) By absorbing light it did not reach the THE SENSORS THIS cONFIRMS OUR HYPOTHESIS.... Sunglasses that have a lens of darker tint will block more UV rays. Also, brown colored lenses will block the most light. Procedure Lens Types Variables Our results confirmed that the darkest lenses absorbed the most UV rays, and that the brown lens was the best at blocking UV. Part of Because as time went on, the altitude was higher, we assumed that as time went on, UV absorbtion would increase. However, we found that UV absorbtion did not increase as altitude increased, therefore the rate and UV absorbtion had no correlation. BUT our results did not agree with the idea that UV light increases with altitude, time, and radiation, and decrease with temperature. Audrey Walts LENSES Megan Swan Megan Swan When choosing sunglasses, does or tint of the lens have a better effect of blocking UV rays? Will sunglasses be less effective at higher altitudes, such as in the mountains? color Audrey Possible Changes Branch out with UV protection:
Sunscreen on clear lens
Test for certain types of UV rays
Add a clear controll lens to test direct UV
Add polarized lens. (lens with UV protectant chemical) Applications The results of the lab can be useful to any person who will purchase sunglasses.

It is clear that dark, brown colored lens are the best at blocking UV rays and thus best at protecting human vision. When buying sunglasses, it is important for the consumer to know that brown is the safest color. Audrey Ozone Ozone molecule The Ozone layer absorbs 97-99% of damaging high frequency UV rays Mainly located in the lower portion of the stratosphere Uv rays are blocked when the UV ray has enough energy to break apart the bond of the ozone, which absorbs the energy Mostly UV-C and some uv-B becuase they have the most energy
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