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Perhaps you mean one of these, I can't tell:

  • Alpha particle radiation: least penetrating ionizing radiation, 100% shielding provided by one sheet of paper.
  • ELF radio: lowest energy radio waves (~0.01Hz), travels long distances and through water. U.S. Navy experimented with it for communicating with Submarines.
  • Red light: Lowest frequency of visible light.
  • Violet light: Shortest wavelength of visible light.
  • Very High Energy Gamma radiation: Shortest wavelength of any known radiation.

Anyway, least in what way?

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13y ago
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9y ago

For all practical purposes any electromagnetic radiation lower in frequency than UV (ultraviolet) is not considered to be ionizing, and there is no "most" or "least" ionizing in that very wide range. They simply do not ionize matter.

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13y ago

The least energetic Electro Magnetic radiation is Very Low Frequency radio waves.

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9y ago

Electromagnetic radiation with frequencies approaching the limit of 0Hz has the least amount of energy.

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13y ago

Ultra Low Radio Frequencies (ULRF)

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12y ago

uv radiation

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12y ago

Radio waves have the lowest frequency.

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Q: What electromagnetic radiation is the least energetic?
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