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      Question

      Which electromagnetic wave has the longest

      wavelength?
      A X-rays Correct Answer Incorrect Answer
      B Gamma rays Correct Answer Incorrect Answer
      C Microwaves Correct Answer Incorrect Answer
      D Radio waves Correct Answer Incorrect Answer

      Solution

      In the electromagnetic spectrum, wavelength increases from gamma rays → X-rays → ultraviolet → visible light → infrared → microwaves → radio waves. Radio waves have the longest wavelength.

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