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A microwave oven works by producing standing waves of electromagnetic radiation inside a closed housing. Consider a microwave oven which is 30 cm wide and

A microwave oven works by producing standing waves of electromagnetic radiation inside a closed housing. Consider a microwave oven which is 30 cm wide and which has five standing wave nodes-  one at each end of the microwave plus three inside the oven itself. What does the frequency of the radiation need to be to produce this pattern?

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