A microwave oven is powered by an electron tube called a magnetron, which genera

Question

A microwave oven is powered by an electron tube called a magnetron, which generates electromagnetic waves of frequency 2.33 GHz. The microwaves enter the oven and are reflected by the walls. The standing wave pattern produced in the oven can cook food unevenly, with hot spots in the food at antinodes and cool spots at nodes, so a turntable is often used to rotate the food and distribute the energy. If a microwave oven intended for use with a turntable is instead used with a cooking dish in a fixed position, the antinodes can appear as burn marks on foods such as carrot strips or cheese. The separation distance between the burns is measured to be 6 cm plusminus 5%. From these data, calculate the speed of the microwaves. m/s plusminus 5%

Explanation / Answer

The distance between node and anti node is half wave

Hence the wavelength will be 12cm

So the speed of the wave will be = wavelegnth * frequency = .12 * 2.33*109 = 2.796 108 m/s

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