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3 Pages

Lab 7 speed of light

Course: PHYSICS 1A+1B, Fall 2010
School: Laney College
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Word Count: 209

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of Lab7 Speed light Instructor: Pro. Tsai Jiajie Huo(Jacky) Member: Yao Bin Yu Zeyuan (Seth) Guan 1. introduction. In this experiment, we are generally focusing on using the mirror reflection and deflation to measure to speed of light. 2. Procedure. a. First, we set up the instruments as the professor told us. b. Start the laser beam, we measured the change of the light point appeared in the flat wood, and...

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of Lab7 Speed light Instructor: Pro. Tsai Jiajie Huo(Jacky) Member: Yao Bin Yu Zeyuan (Seth) Guan 1. introduction. In this experiment, we are generally focusing on using the mirror reflection and deflation to measure to speed of light. 2. Procedure. a. First, we set up the instruments as the professor told us. b. Start the laser beam, we measured the change of the light point appeared in the flat wood, and record its location. c. Then we compared the experimental location with the calculated one. 4. Data Sheet Voltage (V) 12 15 18.5 22 25.5 30 34 38.3 43.3 Freq (Hz) 32 64 96 128 160 192 224 256 288 50 54 60 66 72.5 81.5 88 97 106 115 32 64 96 128 160 192 224 256 288 320 Calibration of Rotating Mirror 700 y = 0.0002x 3 - 0.0721x + 2 11.501x - 93.384 600 Frequency (Hz ) 500 400 300 200 100 0 0 20 40 60 80 100 120 140 Voltage (V) 6. Discussion and conclusion. We did this experiment as a group and therefore, the major work we need to do is to know the theory behind the experiment and get the final difference between the calculated distance and experimental one. As first, our statistic contradicted the theory and we tried to find out the reason behind it. Then we found some reasons. First, the unavoidable light from outside, and it had some influence on our experiment. Second, the lense that deflate the light had once drop, it may not brought back to the original place. Third, the instruments had been moved during the experiments without noticed.
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