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Question 20200
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Electromagnetic Waves and Wave Optics: Radio Waves — Production MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Radio Waves — ProductionHardQuestion 20200

Question

Radio waves are produced by:
  1. A
    Inner electron transitions in atoms
  2. B
    Nuclear decay
  3. C
    Oscillating LC circuits and currents in antennae
    Correct
  4. D
    Mechanical vibration of strings

Correct answer

Oscillating LC circuits and currents in antennae

Explanation

Radio waves (λ from mm to km) are produced by oscillating electrical circuits with frequencies from MHz to GHz and broadcast through antennae. AM radio: 0.5–1.7 MHz; FM radio: 88–108 MHz; WiFi: 2.4 GHz.

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