英語 English:Photon日語 Japanese:光子 (こうし)定義 Definition:The photon is one of the fundamental particles, the smallest unit of substance. Photons make electromagnetic waves such as light.体系 System:物質 (Sub...
英語 English:Isotope日語 Japanese:同位体 (どういたい)定義 Definition:Isotopes are atoms that have the same atomic number but different numbers of neutrons. For example, hydrogen and deuterium are isotopes. Hydro...
英語 English:Radioisotope日語 Japanese:放射性同位体 (ほうしゃせいどういたい)定義 Definition:A radioisotope is one of the isotopes emitting radiation.For example, the uranium atom has an radioisotope called uranium 235( $...