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  2. Alpha particle - Wikipedia

    en.wikipedia.org/wiki/Alpha_particle

    The symbol for the alpha particle is α or α 2+. Because they are identical to helium nuclei, they are also sometimes written as He 2+ or 4 2 He 2+ indicating a helium ion with a +2 charge (missing its two electrons). Once the ion gains electrons from its environment, the alpha particle becomes a normal (electrically neutral) helium atom 4 2 He.

  3. Ionizing radiation - Wikipedia

    en.wikipedia.org/wiki/Ionizing_radiation

    The alpha particle was named by Ernest Rutherford after the first letter in the Greek alphabet, α, when he ranked the known radioactive emissions in descending order of ionising effect in 1899. The symbol is α or α 2+. Because they are identical to helium nuclei, they are also sometimes written as He 2+ or 4 2 He 2+

  4. List of common physics notations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_physics...

    Symbol Name Meaning SI unit of measure alpha: alpha particle: angular acceleration: radian per second squared (rad/s 2) fine-structure constant: unitless beta: velocity in terms of the speed of light c: unitless beta particle: gamma: Lorentz factor: unitless photon: gamma ray: shear strain: radian

  5. Alpha decay - Wikipedia

    en.wikipedia.org/wiki/Alpha_decay

    Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or "decays" into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two.

  6. Alpha (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Alpha_(disambiguation)

    Alpha particle, form of particle radiation; Alpha waves, recorded by electroencephalography; Angle of attack in aerodynamics (symbol "α") Angular acceleration in physics (symbol "α") Coefficient of thermal expansion in thermodynamics (symbol "α") Fine-structure constant in physics (symbol "α") Thermal diffusivity in thermodynamics (symbol "α")

  7. Fine-structure constant - Wikipedia

    en.wikipedia.org/wiki/Fine-structure_constant

    In physics, the fine-structure constant, also known as the Sommerfeld constant, commonly denoted by α (the Greek letter alpha), is a fundamental physical constant which quantifies the strength of the electromagnetic interaction between elementary charged particles.

  8. These are the pedophile symbols you need to know to protect ...

    www.aol.com/news/2016-04-26-these-are-the...

    A FBI document obtained by Wikileaks details the symbols and logos used by pedophiles to identify sexual preferences. According to the document members of pedophilic organizations use of ...

  9. Radiation - Wikipedia

    en.wikipedia.org/wiki/Radiation

    Alpha particle detected in an isopropanol cloud chamber. Alpha particles are helium-4 nuclei (two protons and two neutrons). They interact with matter strongly due to their charges and combined mass, and at their usual velocities only penetrate a few centimetres of air, or a few millimetres of low density material (such as the thin mica ...