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  • The Old Style Cathode Ray Tube

    The cathode ray tube is a very common device used in television sets and computer screens. Inside the tube is a vacuum, so the electrons are free to move and do not hit any gas molecules. Electrons are emitted from a negative cathode at A, which is...

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  • The Cases For and Against Nuclear Power

    Before nuclear power there was the nuclear bomb, and the presence of the nuclear bomb casts a shadow over the debate about nuclear power, even between countries. Many countries think that nuclear bombs are being developed under the cover of nuclear...

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  • Rutherford's Model of the Atom

    An experiment which involved firing alpha particles at a piece of thin gold filed lead Ernest Rutherford to draw up a new model of the atom as a very small heavy nucleus surrounded by orbiting electrons. To the great surprise of Rutherford, and the two...

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  • Graphical Representation of Uncertainty

    In many situations the best method to present an assess data is to use a graph. Error bars enable goodness of fit to a specific statistical model to be assessed. Since the error represents the uncertainty range, the best fit curve should pass through...

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  • Error Anaysis 2

    Error has to do with uncertainty in measurements that nothing canbe done about. A metre rule might measure to the nearest mm. If ameasurement is repeated, the length obtained may differ and none ofthe measurements can be preferred. Although it is not...

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  • Counting Permutations

    Permutations is that part of statistics involving arrangements of objects, some of which fall in the same group and some of which fall in different groups. Each object is distinct from all the other objects, so we can tell each one apart, and if two...

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  • Sampling Methods

    Gathering statistics involves time and effort. It is a necessary procedure – governments need to know how many schools to build, or policemen to employ, and companies need to know which products people will buy. They could go out and ask everyone, but...

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  • Pie Charts

    60 children go to school. There are various methods they use – they may walk, go by car, bus or train. The statistics are in the following table. Method of Going to School Frequency Angle Walk 21 Car 15 Bus 20 Train 4 Total 60 360 Because it is for a...

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