By Alan Gladwell
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Extra info for Advances in Physics
8. If this signal were to be amplified 3 times, would it exceed the maximum voltage of the system? What would the limits on the signal be? Resistivity and Conductivity Resistivity and conductivity are material properties: they apply to all examples of a certain material anywhere. They are not the same as resistance and conductance, which are properties of individual artefacts. This means that they only apply to a given object. They describe how well a material resists or conducts an electric current.
The distance in the medium between two 'peaks' or 'troughs' (maxima and minima on the waveform) is known as the wavelength of the wave. Types of Waves Waves can be categorised according to the direction of the effect of the disturbance relative to the direction of travel. A wave which causes disturbance in the direction of its travel is known as a longitudinal wave, whereas a wave which causes disturbance perpendicular to the direction of its travel is known as a transverse wave. Longitudinal wave (eg.
2. 5mm, a resistance of 1 MΩ, and is 4680 km long. What is the resistivity of copper? 3. Gold has a conductivity of 45 MS m-1. 05m long? 4. A strand of metal is stretched to twice its original length. What is its new resistance? State your assumptions. 5. Which has the greater resistivity: a plank or a piece of sawdust, made from the same wood? Semiconductors Silicon, doped with phosphorous A semiconductor has a conductivity between that of a conductor and an insulator. They are less conductive than metals, but differ from metals in that, as a semiconductor heats up, its conductivity rises.