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1000000 zeptometres = 1 femtometre = 1 fermi = 0.000001 nanometre = 10 −15 metres 1 000 000 000 000 femtometres = 1 millimetre . For example, the charge radius of a proton is approximately 0.841 femtometres [ 3 ] while the radius of a gold nucleus is approximately 8.45 femtometres.
The femtometre, used mainly in particle physics, is sometimes called a fermi. For large scales, megametre, gigametre, and larger are rarely used. Instead, ad hoc non-metric units are used, such as the solar radius, astronomical units, light years, and parsecs; the astronomical unit is mentioned in the SI standards as an accepted non-SI unit.
1 femtometer (fm, fermi) 1 fm Approximate limit of the gluon-mediated color force between quarks [6] [7] 1.5 fm Effective cross section radius of an 11 MeV proton [8] 2.81794 fm Classical electron radius [9] 3 fm Approximate limit of the meson-mediated nuclear binding force [6] [7] 750 to 822.25 fm Longest wavelength of gamma rays: 10 −12: 1 ...
femtosecond: fs One quadrillionth of one second 1 fs: The cycle time for ultraviolet light with a wavelength of 300 nanometres; The time it takes light to travel a distance of 0.3 micrometres (μm). 7.58fs: The period of vibration of a hydrogen molecule.
A barn (symbol: b) is a metric unit of area equal to 10 −28 m 2 (100 fm 2).This is equivalent to a square that is 10 −14 m (10 fm) each side, or a circle of diameter approximately 1.128 × 10 −14 m (11.28 fm).
Image source: Getty Images. 1. Working while collecting benefits. If you continue to work while collecting Social Security, there are two potential effects on your retirement benefits.
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