Alpha Particles

Some articles on alpha particles, particle, alpha, alpha particle, particles:

... Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus ... They are generally produced in the process of alpha decay, but may be produced also in other ways ... Alpha particles are named after the first letter in the Greek alphabet, α ...
Alpha-particle - Energy and Absorption
... The energy of the alpha emitted in alpha decay is mildly dependent on the half-life for the emission process, with many orders of magnitude differences in ... The energy of alpha particles emitted varies, with higher energy alpha particles being emitted from larger nuclei, but most alpha particles have energies of between 3 and 7 MeV (mega-electron-vo ... This energy is a substantial amount of energy for a single particle, but their high mass means alpha particles have a lower speed (with a typical kinetic energy of 5 MeV the speed is 15,0 ...
Alpha-particle - History of Discovery and Use
... separated radiation into three types eventually named alpha, beta, and gamma by Rutherford, based on penetration of objects and deflection by a magnetic field ... Alpha rays were defined by Rutherford as those having the lowest penetration of ordinary objects ... Rutherford's work also included measurements of the ratio of an alpha particle's mass to its charge, which led him to the hypothesis that alpha particles were doubly charged helium ions (later shown to be bare ...
Atomic Nucleus - Introduction - History
... Rutherford later devised an experiment that involved the deflection of alpha particles at a thin sheet of metal foil ... if Thomson's model were correct, the immense alpha particles would easily pass through the foil with very little deviation in their paths ... To his surprise, many of the particles were deflected at very large angles ...
Age Of The Earth - Radiometric Dating - Invention of Radiometric Dating
... In radioactive decay, an element breaks down into another, lighter element, releasing alpha, beta, or gamma radiation in the process ... the first step toward radiometric dating by suggesting that the alpha particles released by radioactive decay could be trapped in a rocky material as helium atoms ... At the time, Rutherford was only guessing at the relationship between alpha particles and helium atoms, but he would prove the connection four years ...

Famous quotes containing the words particles and/or alpha:

    The atoms of Democritus
    And Newton’s particles of light
    Are sands upon the Red Sea shore,
    Where Israel’s tents do shine so bright.
    William Blake (1757–1827)

    Imagination is a valuable asset in business and she has a sister, Understanding, who also serves. Together they make a splendid team and business problems dissolve and the impossible is accomplished by their ministrations.... Imagination concerning the world’s wants and the individual’s needs should be the Alpha and Omega of self-education.
    Alice Foote MacDougall (1867–1945)