In microwave ovens _ is used to heat the food
Correct answer: D. Electromagnetic rays
- A. X-rays
- B. Beta rays
- C. Gamma rays
- D. Electromagnetic rays
Explanation
Microwave ovens heat food using microwaves, a form of electromagnetic radiation similar to radio waves. Microwaves have three characteristics that allow them to be used in cooking: they are reflected by metal; they pass through glass, paper, plastic, and similar materials; and they are absorbed by foods.OPTIONS A, B & C: They might cause the food to become radioactive so these options are incorrect.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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