алфа-честица

алфа-честица

1) Nucleus formed by the α-process (q.v.) (see even-even nuclei.)

2) Particle first discovered in radioactive α decay, and later identified as helium nuclei (two protons and two neutrons bound together.)

3) The nucleus of a 4He atom, consisting of two protons and two neutrons. Mass of α-particle 4.00260 amu.

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Nozare/domēns: Astronomy
Category: General astronomy
Company: Caltech
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алфа честица

Physics; General physics

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

алфа честица

Chemistry; General chemistry

A particle that is commonly ejected from radioactive nuclei, consisting of two protons and two neutrons. Alpha particles are helium nuclei. Alpha particles have a mass of 6.644 ...

честица

Semiconductors; Silicon wafer

A small,discrete piece of foreign material or silicon not connected crystallography to the wafer.

честица

Pharmaceutical; Medical devices;

a tiny mass of material.

zenit

Astronomy; General astronomy

The point directly overhead in the sky.

рефрактор

Astronomy; General astronomy

A telescope that uses as its primary optical element a lens. Binoculars are a type of refractor. In general, refractors are much more expensive to build and buy than are ...

рефлектор

Astronomy; General astronomy

A telescope that uses as its primary optical element a mirror. Nearly all large telescopes in use today by amateur and professional astronomers are reflecting telescopes.

фотометрија

Astronomy; General astronomy

In astronomy, the measurement of the light emitting from astronomical objects, generally in the visible or infrared bands, in which a specific or general wavelength band is ...

паралакса

Astronomy; General astronomy

The apparent displacement or the difference in apparent direction of an object as seen from two different points not on a straight line with the object (as from two different ...

орбита

Astronomy; General astronomy

The path of one object about another (used here for an object orbiting the sun).

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