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Question 20190
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Electromagnetic Waves and Wave Optics: Microwaves — Radar MCQ

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Microwaves — RadarEasyQuestion 20190

Question

Microwaves are used in radar and cooking because:
  1. A
    They have high energy and ionise air
  2. B
    They have suitable wavelengths for reflection detection and resonance absorption by water molecules
    Correct
  3. C
    They travel faster than visible light
  4. D
    They are longitudinal

Correct answer

They have suitable wavelengths for reflection detection and resonance absorption by water molecules

Explanation

Radar: microwave pulses reflect off objects allowing distance and speed measurement. Microwave ovens: 2.45 GHz microwaves are absorbed by water molecules (resonance), heating food from inside out.

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