18th February 2005 at 00:00
KS 4-5

A wonderful animation to explain how metal detectors work is at http:micro.magnet.fsu.eduelectromagjavadetectorindex.html

We may not know what cables and pipes are underground but what sensors can be put underground to detect what's going on above? A good overview is at www.epa.govwatersecurityguideexteriorburiedintrusionsensors.html. Ideas on sensor building can be found at http:advancingphysics.iop.orgresourcesOCRCswkGuide.pdf There are lovely activities on what's underground in Salters Horners Advanced Physics AS.

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