“magnitude”的概念、定义、习题解题方法及翻译-物理辞典

单词	magnitude
释义	magnitude A measure of the relative brightness of a star or other celestial object. The apparent magnitude depends on the star's luminosity, its distance, and the absorption of light between the object and the earth. In 1856 the astronomer N. R. Pogson devised a scale in which a difference of five magnitudes corresponds to a brightness ratio of 100 to 1. Two stars that differ by one magnitude therefore have a brightness ratio of (100)^0.2:1 = 2.512, known as the Pogson ratio . This scale is now universally adopted. Apparent magnitudes are not a measure of luminosity, which is defined in terms of the absolute magnitude . This is the apparent magnitude of a body if it was situated at a standard distance of 10 parsecs
随便看	counter couple coupling coupling constant CP invariance CPT theorem CPU creep critical angle critical damping critical mass critical pressure critical reaction critical state critical temperature critical volume CRO Crookes, Sir William cross product cross section crucible cryogenic pump cryogenics cryohydrate cryometer

物理辞典收录了3346条物理词条，基本涵盖了常用物理知识及物理英语单词词组的翻译及用法，是物理学习的有利工具。