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  • Physics Factsheet: 119. Calculations on the Quantum Atom

    Physics Factsheet: 119. Calculations on the Quantum Atom

    Examiners’ reports have highlighted some common errors made by students in attempting energy level calculations. In this Factsheet we shall concentrate on getting the calculations correct rathe...

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  • Physics Factsheet: 120. Interpreting and Drawing Graphs of Motion

    Physics Factsheet: 120. Interpreting and Drawing Graphs of Motion

    In Factsheet 116, we looked at graphical work with electricity. This was in response to Examiner’s Reports suggesting that students have displayed weaknesses in sketching and interpreting graphs...

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  • Physics Factsheet: 121. Sound Compression

    Physics Factsheet: 121. Sound Compression

    When we download tracks, or rip a CD onto our computer, we end up with a data file from which music can be reproduced. The original music file has been compressed, often by a factor of perhaps ten tim...

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  • Physics Factsheet: 122. Uses of Ultrasound

    Physics Factsheet: 122. Uses of Ultrasound

    Humans can hear sound across a wide range of frequencies, typically from 20 to 20,000 Hertz (waves per second).  Younger people can usually hear even higher pitched sounds, possibly up to 22,000H...

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  • Physics Factsheet: 123. Understanding Frictional Forces

    Physics Factsheet: 123. Understanding Frictional Forces

    Friction is a phenomenon which gives rise to forces which influence many activities in everyday life. Indeed, some activities depend on frictional forces, e.g. walking along a pavement, leaning a ladd...

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  • Physics Factsheet: 124. Forces on Static Structures

    Physics Factsheet: 124. Forces on Static Structures

    Force is a vector.  Vectors contain two items of information, the magnitude and direction. (Scalars only contain a magnitude.) A change in either magnitude  or direction , or both, means a c...

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  • Physics Factsheet: 125. Energy Efficiency in Power Generation

    Physics Factsheet: 125. Energy Efficiency in Power Generation

    How can we power our civilisation?  Replacing fossil fuel power stations with renewable sources of energy such as wind and solar is a possibility, but just how efficient are the different resourc...

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  • Physics Factsheet: 126. Carbon Dioxide Calculations

    Physics Factsheet: 126. Carbon Dioxide Calculations

    We are deluged with facts and figures about carbon dioxide emissions from power stations, vehicles, aircraft, etc. Usually the numbers quoted are in the region of thousands or even millions of tonnes ...

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  • Physics Factsheet: 127. Molecules, Moles and Mass

    Physics Factsheet: 127. Molecules, Moles and Mass

    This Factsheet focuses on questions and calculations about gases....

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  • Physics Factsheet: 128. Calculations: First Law of Thermodynamics

    Physics Factsheet: 128. Calculations: First Law of Thermodynamics

    The first law of thermodynamics can be explained by Fig 1 which  shows a frictionless cylinder and piston containing a quantity of  gas....

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