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Physics of the Microwave Oven
Transcript of Physics of the Microwave Oven
bump into other molecules;
more rapid motion
(increase kinetic energy) frictional heating microwave energy converted to heat energy Your meal gets nice & hot! The production of microwaves in a MAGNETRON For food to be heated,
microwaves must pass through the food. produced by a magnetron hollow tube cylindrical cathode through center & outside shaped with several cavities, acting as an anode electric field exists in gap, inside tube cathode- the electrode or terminal by which current leaves an electrolytic cell, voltaic cell, battery, etc. anode- the electrode or terminal by which current enters an electrolytic cell, voltaic cell, battery, etc. electrons pushed towards area of excess negative charge negative charge pushed back around cavity oscillation of electric & magnetic fields Hazards! liquids can superheat explosive, spontaneous boiling (nucleation) closed containers & eggs- explode (increased pressure, steam) jawbreakers Direct microwave exposure generally not of any hazard U.S. FDA limits microwave leakage to 5 milliwatts per square cm. not harmful to human health THE END! WORKS CITED