Parallax Error Physics Experiment
Contents |
Use of Errors Determination of Errors Experimental Errors Random Errors Distribution Curves Standard Deviation Systematic Errors Errors in Calculated Quantities Rejection of Readings MEASUREMENT All science is concerned with measurement. This fact requires that we
Sources Of Error In Experiments
have standards of measurement. Standards In order to make meaningful measurements in science we types of errors in experiments need standards of commonly measured quantities, such as those of mass, length and time. These standards are as follows: 1. The kilogram
Examples Of Experimental Errors
is the mass of a cylinder of platinum-iridium alloy kept at the International Bureau of Weights and Measures in Paris. By 2018, however, this standard may be defined in terms of fundamental constants. For further information read: http://www.nature.com/news/kilogram-conflict-resolved-at-last-1.18550 experimental error examples chemistry . 2.The metre is defined as the length of the path travelled by light in a vacuum during a time interval of 1/299 792 458 of a second. (Note that the effect of this definition is to fix the speed of light in a vacuum at exactly 299 792 458 ms-1). 3.The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine experimental error examples physics levels of the ground state of the caesium 133 atom. It is necessary for all such standards to be constant, accessible and easily reproducible. Top SI Units Scientists all over the world use the same system of units to measure physical quantities. This system is the International System of Units, universally abbreviated SI (from the French Le Systme International d'Units). This is the modern metric system of measurement. The SI was established in 1960 by the 11th General Conference on Weights and Measures (CGPM, Confrence Gnrale des Poids et Mesures). The CGPM is the international authority that ensures wide dissemination of the SI and modifies the SI as necessary to reflect the latest advances in science and technology. Thus, the kilogram, metre and second are the SI units of mass, length and time respectively. They are abbreviated as kg, m and s. Various prefixes are used to help express the size of quantities eg a nanometre = 10-9 of a metre; a gigametre = 109 metres. See the table of prefixes below. Table 1. SI prefixes Factor Name Symbol 1024 yotta Y 1021 zetta Z 1018 exa E 1015 peta P 1012 tera T 109 giga G 106 mega M 103 kilo k 102 hecto h 101 deka da Factor Name Symbol 10-1 deci d 10-2
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Source Of Error Definition
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