- 1光子
A photon is a tiny packet of energy that light is made of. In physics you learn that light can act like a wave, and it can also act like a stream of these little packets; each packet is one photon. A photon has zero mass. It cannot sit still: in empty space it always travels at the speed of light. The energy it carries is what lets sunlight warm your skin, or knock an electron free in a solar panel. Though actually, use the same word for this kind of packet in all electromagnetic radiation, not only the light your eyes can see — radio , microwaves, X-rays. It is a classroom and lab word. People do not say it when they ask you to turn on the lamp.
組成photo- (light) + -on (a physics ending for a tiny particle). An American physicist, Leonard Troland, coined it in 1916 as a unit of light hitting the eye. Gilbert N. Lewis later used it in the modern physics sense, and by the late 1920s other physicists had accepted the word.
同家族的字
- photographsame photo-: light
- electron-on is the usual ending for this kind of tiny physics particle
- protonsame -on particle ending
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
photonnoun/ˈfəʊtɒn/
- 1
natural-sciencesphysical-sciencesphysicsThe quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime. It is a gauge boson.
- The single-imaging optic of the mammalian eye offers some distinct visual advantages. Such lenses can take in photons from a wide range of angles, increasing light sensitivity. They also have high spatial resolution, resolving incoming images in minute detail.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。