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# Reflectivity of Light Biology Lab

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Introduction

Title: Reflectivity of Light Part A PLANNING A Purpose: To calculate the percent of reflectivity of various colors. Problem: Prediction: Experimental Design: Refer to Hand-out Variables: a) Manipulated Variable: b) Responding Variable: c) Controlled Variables: PLANNING B Materials: Refer to Hand-out Procedures: Refer to Hand-out DATA COLLECTION Evidence: The Reflection Value of Different Colors Color Aluminum Black White Red Blue Reflection Value 0.900 0.420 0.864 0.866 0.744 DATA PROCESSING AND PRESENTATION Analysis: Calculate the Percent Reflectivity (Albedo) of Each Color % Reflectivity = (Value for Paper)/(Value for Aluminum) x 100% % Reflectivityaluminum = (0.900)/(0.900) x 100% = 100% % Reflectivityblack = (0.420)/(0.900) x 100% = 46.67% % Reflectivitywhite = (0.864)/(0.900) x 100% = 96% % Reflectivityred = (0.866)/(0.900) x 100% = 96.22% % Reflectivityblue = (0.744)/(0.900) x 100% = 82.67% CONCLUSION AND EVALUATION Conclusion: Through the findings of this experiment, different colors yield different percent of reflectivity. ...read more.

Middle

The clouds are white, the two poles are covered with white snow, and the oceans are clear and can diffract light (if struck correctly, it can diffract light at a degree so that it fully reflects it). As well, Earth contains many different metals, most of which are lustrous and has high reflectivity. And, not many things on Earth are black, which has a very low albedo. Part B The Albedo Effect, Surface Conditions PLANNING A Purpose: Problem: What is the effect of surface conditions on the ability of a material to reflect light energy? Prediction: Experimental Design: Refer to Hand-out Variables: d) Manipulated Variable: e) Responding Variable: f) Controlled Variables: PLANNING B Materials: Refer to Hand-out Procedures: Refer to Hand-out DATA COLLECTION Evidence: The Reflection Value of Different Surface Conditions Color Water Red Shale Sand Gravel Glass Reflection Value 0.120 0.644 0.590 0.429 0.284 DATA PROCESSING AND PRESENTATION ...read more.

Conclusion

Another example would be the two poles, where their latitude is not the only factor that accounts for their low temperatures. The white snow and ice has a relatively high albedo, meaning more reflection of light energy then absorption, thus a cooler climate. 3. Since both color and surface conditions can affect the albedo of a certain substance, then parts of the biosphere that may contain both high albedo colors and surface conditions would have a very high albedo overall, creating a cooler environment. And if an area had low albedo colors and surface conditions, then that area would have a very low albedo overall, creating a warmer environment. A specific example would be the arctic, where the snow and ice yields high albedo, and the white color yields high albedo as well. Thus the arctic is cooler because of it. REFERENCE KevinTse January 16, 2006 ...read more.

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