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  2. Van der Waals force - Wikipedia

    en.wikipedia.org/wiki/Van_der_Waals_force

    For individual atoms, the equilibrium distance is between 0.3 nm and 0.5 nm, depending on the atomic-specific diameter. [7] When the interatomic distance is greater than 1.0 nm the force is not strong enough to be easily observed as it decreases as a function of distance r approximately with the 7th power (~ r −7 ).

  3. List of possible dwarf planets - Wikipedia

    en.wikipedia.org/wiki/List_of_possible_dwarf_planets

    The number of dwarf planets in the Solar System is unknown. Estimates have run as high as 200 in the Kuiper belt [1] and over 10,000 in the region beyond. [2] However, consideration of the surprisingly low densities of many large trans-Neptunian objects, as well as spectroscopic analysis of their surfaces, suggests that the number of dwarf planets may be much lower, perhaps only nine among ...

  4. Race and ethnicity in the United States census - Wikipedia

    en.wikipedia.org/wiki/Race_and_ethnicity_in_the...

    As the 2010 census form did not contain the question titled "Ancestry" found in prior censuses, there were campaigns to get non-Hispanic West Indian Americans, [36] Turkish Americans, [37] Armenian Americans, Arab Americans, and Iranian Americans to indicate their ethnic or national background through the race question, specifically the "Some ...

  5. Gamma ray - Wikipedia

    en.wikipedia.org/wiki/Gamma_ray

    An acute full-body equivalent single exposure dose of 1 Sv (1000 mSv), or 1 Gy, will cause mild symptoms of acute radiation sickness, such as nausea and vomiting; and a dose of 2.0–3.5 Sv (2.0–3.5 Gy) causes more severe symptoms (i.e. nausea, diarrhea, hair loss, hemorrhaging, and inability to fight infections), and will cause death in a ...