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A microwave oven delivers 800 W into a cavity of cross-section 0.1 m². The mean power density is

  • A.80 W/m²
  • B.80 kW/m²
  • C.800 W/m²
  • D.8 kW/m²

Answer: D

Dividing gives eight kilowatts per square metre, some eight times the intensity of sunlight, and the corresponding field is about 1.7 kilovolts per metre. Standing waves within the cavity make the local value vary widely about that mean.

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