| 单词 | alpha particle |
| 释义 | alpha particlenoun Physics.a positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay or nuclear fission; the nucleus of a helium atom. Origin of alpha particleFirst recorded in 1900–05 Words nearby alpha particlealpha-linolenic acid, alpha-lipoprotein, alpha male, alpha-naphthylthiourea, alphanumeric, alpha particle, alpha privative, alpha radiation, alpha ray, alpha receptor, alpha rhythm Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for alpha particlealpha particle nouna helium-4 nucleus, containing two neutrons and two protons, emitted during some radioactive transformations Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for alpha particlealpha particle n.A positively charged nuclear particle, indistinguishable from a helium atom nucleus and consisting of two protons and two neutrons. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for alpha particlealpha particle A positively charged particle that consists of two protons and two neutrons bound together. It is emitted by an atomic nucleus undergoing radioactive decay and is identical to the nucleus of a helium atom. Because of their relatively large mass, alpha particles are the slowest and least penetrating forms of nuclear radiation. They can be stopped by a piece of paper. See more at radioactive decay. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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