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  2. Particle decay - Wikipedia

    en.wikipedia.org/wiki/Particle_decay

    In particle physics, particle decay is the spontaneous process of one unstable subatomic particle transforming into multiple other particles. The particles created in this process (the final state) must each be less massive than the original, although the total mass of the system must be conserved. A particle is unstable if there is at least ...

  3. Lifetime Products - Wikipedia

    en.wikipedia.org/wiki/Lifetime_Products

    Website. www.Lifetime.com. Lifetime Products Inc. is a privately owned company founded in 1986. Its main products are blow-molded polyethylene folding chairs and tables, picnic tables, home basketball equipment, [2] sheds, coolers, kayaks and paddleboards, and lawn and garden items, along with OEM steel and plastic items from other companies.

  4. Exponential decay - Wikipedia

    en.wikipedia.org/wiki/Exponential_decay

    Thus, the amount of material left is 21 = 1/2 raised to the (whole or fractional) number of half-lives that have passed. Thus, after 3 half-lives there will be 1/2 3 = 1/8 of the original material left. Therefore, the mean lifetime is equal to the half-life divided by the natural log of 2, or:

  5. Proton decay - Wikipedia

    en.wikipedia.org/wiki/Proton_decay

    Proton decay. The pattern of weak isospins, weak hypercharges, and color charges for particles in the Georgi–Glashow model. Here, a proton, consisting of two up quarks and a down, decays into a pion, consisting of an up and anti-up, and a positron, via an X boson with electric charge − ⁠ 4 3 ⁠e. In particle physics, proton decay is a ...

  6. List of physical quantities - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_quantities

    List of physical quantities. This article consists of tables outlining a number of physical quantities. The first table lists the fundamental quantities used in the International System of Units to define the physical dimension of physical quantities for dimensional analysis. The second table lists the derived physical quantities.

  7. Age of the universe - Wikipedia

    en.wikipedia.org/wiki/Age_of_the_universe

    In physical cosmology, the age of the universe is the time elapsed since the Big Bang.Astronomers have derived two different measurements of the age of the universe: [1] a measurement based on direct observations of an early state of the universe, which indicate an age of 13.787 ± 0.020 billion years as interpreted with the Lambda-CDM concordance model as of 2021; [2] and a measurement based ...

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