9_4_4

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 * 4. Investigations into the electrical properties of particular metals at different temperatures led to the identification of superconductivity and the exploration of possible applications
 * outline the methods used by the Braggs to determine crystal structure
 * identify that metals possess a crystal lattice structure
 * describe conduction in metals as a free movement of electrons unimpeded by the lattice
 * identify that resistance in metals is increased by the presence of impurities and scattering of electrons by lattice vibrations

http://science.uniserve.edu.au/school/quests/superwq.html The web quest covers the following outcomes.
 * Activity**: Open the following website to complete the webquest on superconductors.
 * describe the occurrence in superconductors below their critical temperature of a population of electron pairs unaffected by electrical resistance
 * discuss the BCS theory
 * discuss the advantages of using superconductors and identify limitations to their use
 * process information to identify some of the metals, metal alloys and compounds that have been identified as exhibiting the property of superconductivity and their critical temperatures
 * analyse information to explain why a magnet is able to hover above a superconducting material that has reached the temperature at which it is superconducting
 * gather and process information to describe how superconductors and the effects of magnetic fields have been applied to develop a maglev train
 * process information to discuss possible applications of superconductivity and the effects of those applications on computers, generators and motors and transmission of electricity through power grids

Activity: Use Magnetic Levitation kit and liquid nitrogen to demonstrate magnetic levitation.
 * perform an investigation to demonstrate magnetic levitation