...The charge of an electron is approximately 1.602× 10-19 C, while the energy gained by a particle with a charge of 1 C accelerated between two points with a potential difference of 1 V is defined as 1 J, so 1 eV is approximately 1.602× 10-19 J. For higher energies, the units kiloelectronvolt keV, megaelectronvolt MeV, and gigaelectronvolt GeV are used, depending on the degree of energy. The energy of a single photon of ultraviolet light, visible light, etc. can also be expressed in eV units by approximately 1240/λ, if the wavelength λ (nm) is known. ... *Some of the terminology that mentions "gigaelectron volts" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…電子のもつ電荷は約1.602×10-19Cであり,一方,1Cの電荷をもつ粒子が1Vの電位差の2点間で加速されて得るエネルギーが1Jと定められているから,1eVは約1.602×10-19Jである。エネルギーが高い場合には,その程度により,キロ,メガ,ギガの接頭語をつけて,それぞれキロ電子ボルトkeV,メガ電子ボルトMeV,ギガ電子ボルトGeVの単位が用いられる。紫外線,可視光線などの光子1個のエネルギーも,その波長λ(nm)が知れると,およそ1240/λによってeV単位で表すことができる。… ※「ギガ電子ボルト」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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