Alpha particle

Alpha particle

The nucleus of a helium atom (two protons and two neutrons) emitted as radiation from a decaying heavy nucleus.

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Category: General physics
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alpha particle

Energy; Nuclear energy

A positively charged particle ejected spontaneously from the nuclei of some radioactive elements. It is identical to a helium nucleus that has a mass number of 4 and an ...

alpha particle

Energy; Nuclear energy

A positively charged particle ejected spontaneously from the nuclei of some radioactive elements. It is identical to a helium nucleus that has a mass number of 4 and an ...

alpha particle

Natural environment; Coral reefs

A particle emitted from the nucleus of an atom, containing two protons and two neutrons, identical to the nucleus (without the electrons) of a helium atom.

alpha particle

Medical devices; Radiology equipment

(image) the nucleus of a helium atom, made up of two neutrons and two protons with a charge of +2. Certain radioactive nuclei emit alpha particles. Alpha particles generally carry ...

alpha particles

Science; Basic science

A particle of matter that is made of two protons and two neutrons. Alpha particles shoot out of nucleus of some radio-active element when they break down into smaller elements ...

alpha particle

Engineering; Electronic engineering

A nuclear particle bearing a positive charge. Consisting of two protons and two neutrons, it is given off by certain radioactive substances. Compare beta rays and gamma rays.

accelerometer

Physics; General physics

Device to measure the accelerate, used for the plane or the rocket.

acre

Physics; General physics

English unit of area measurement, equal 4840 square yards, equal 4046.86 square meter.

spherical aberration

Physics; General physics

The mirror or lens, causing image distortion in shape.

two-state quantum system

Physics; General physics

Second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion.

ray

Physics; General physics

A narrow beam of light, heat, or some other form of radiant energy: The sun's rays are hottest in the middle of the day.

Hidden variable theory

Physics; General physics

Historically, in physics, hidden variable theories were espoused by some physicists who argued that quantum mechanics is incomplete.

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