PH2011 Experiment 1: Uncertainties in Measurements Get you Stopwatch (you can use your phone) and Excel spreadsheet ready. We’ll take Time measured between first and second bounce of a pingpong ball 5 number of times measured 4 3 2 1 0 75 76 77 78 79 80 81 82 83 84 85 86 time between bounces (1/100 s) 30 measurements of t = time between two bounces of a ping pong ball dropped from a height of 1 meter. 1) Average (mean) time between bounces t : ___________ 2) Standard deviation 𝑠𝑡 : ___________ 3) Does about 2/3 of your data fall within one standard deviation of the mean? ______ 4) Error on the mean (i.e. Uncertainty on the mean): ________ 5) Estimation of the systematic error: _______ 6) Write your measured value for the average time along with the total uncertainty in the proper format 𝑡̄ ± 𝛥𝑡 (i.e. if you measured t̅ = 0.79 s and a total uncertainty of 𝛥𝑡 = 0.31 s, write down “t̅ = 0.79 s ± 0.31 s” , this is the proper way to communicate the results of your experiment): __________ 1
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