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# Untitled 1 - 2.69 of measurements between μ-σ and μ σ...

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John Karlen Lab Partner: Greg Physics 286 Experiment 1: Radioactivity 2/14/10 I Introduction : The purpose of the lab is to study different kinds of radiation and their affect on different kinds of matter. We employ a Geiger Mueller tube, which consists of a tube with a window, through which the radiation is shot. A wire at a potential of several hundred volts above the tube, is suspended within the tube. When a radiation particle ionizes the low pressure gas in the tube, it creates an avalanche of electrons and positive ions, which create a current pulse. The pulse is registered as a count. The Geiger Mueller tube gives tells us how much radiation enters its tube, allowing us to analyze the radiation from various sources and in different ways. II Analysis : Part A: Trial 1 Trial 2 Trial 3 Mean 665 691 664 Standard Deviation 25 24 19 Standard Error of the Mean 3.54 3.39

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Unformatted text preview: 2.69 # of measurements between μ-σ and μ+σ 36 36 37 Analysis: Trial 1 and 3 agree within their errors (665±3.39 is within 664±2.69), but the Trial 1 and 3 means are more than 7 errors away from the Trial 2 mean. -Trial 1: (μ)^(.5) = 25.8 this value is very close to σ = 25-Trial 2: (μ)^(.5) = 26.3 this value is very close to σ = 24-Trial 3: (μ)^(.5) = 25.8 this value is somewhat close to σ = 19 We can also see that the distribution of n-values resembles a Gaussian distribution in each of the three trials, as is evidenced by the histograms of the n-values. In trials 1, 2 and 3, the percentage of the n-values that fell within the standard of deviation were 72%, 72% and 74% respectively. These percentages all agree with the predicted 68.3% of values that fall within σ of the mean in a gaussian distribution....
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## This document was uploaded on 10/31/2011 for the course PHYSICS 286 at UMass (Amherst).

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Untitled 1 - 2.69 of measurements between μ-σ and μ σ...

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