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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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14y ago

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