5) A microwave oven is powered by an electron tube called amagnetron, which gene

Question

5) A microwave oven is powered by an electron tube called amagnetron, which generates electromagnetic waves of frequency2.75 GHz. The microwaves enter the ovenand are reflected by the walls. The standing wave pattern producedin the oven can cook food unevenly, with hot spots in the food atantinodes and cool spots at nodes, so a turntable is often used torotate the food and distribute the energy. If a microwave ovenintended for use with a turntable is instead used with a cookingdish in a fixed position, the antinodes can appear as burn marks onfoods such as carrot strips or cheese. The separation distancebetween the burns is measured to be 5cm ± 5%. From these data, calculate the speed of themicrowaves.

m/s ± 5%
5) A microwave oven is powered by an electron tube called amagnetron, which generates electromagnetic waves of frequency2.75 GHz. The microwaves enter the ovenand are reflected by the walls. The standing wave pattern producedin the oven can cook food unevenly, with hot spots in the food atantinodes and cool spots at nodes, so a turntable is often used torotate the food and distribute the energy. If a microwave ovenintended for use with a turntable is instead used with a cookingdish in a fixed position, the antinodes can appear as burn marks onfoods such as carrot strips or cheese. The separation distancebetween the burns is measured to be 5cm ± 5%. From these data, calculate the speed of themicrowaves.

m/s ± 5%

Explanation / Answer

distance between 2 adjacent antinodes: /2=5 cm ± 5% speed of microwave *f=v=0.1*2.75GHz=2.75*108 m/s± 5%

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