Multiple choice general knowledge

By using what waves Radar detect object?

  1. radio waves

  2. Electromagnetic waves

  3. ultrasonic waves

  4. others
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Radar (Radio Detection And Ranging) systems use radio waves to detect objects. Radio waves are a type of electromagnetic wave, but the specific answer expected is 'radio waves' as radar uses the radio frequency portion of the electromagnetic spectrum. It does not use ultrasonic waves (sound).

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