SAT2物理常用术语词汇整理（B）

　　为了方便广大考生更好的复习，和谐英语网综合整理了SAT2物理常用术语词汇，以供各位考生考试复习参考,希望对考生复习有所帮助。愿大家都能取得好成绩，更多有关留学考试的资讯与辅导资料敬请关注和谐英语网留学考试频道。

　　B

　　Basis vector

　　A vector of magnitude 1 along one of the coordinate axes. Generally, we take the basis vectors to be and , the vectors of length 1 along the x- and y-axes, respectively.

　　Beats

　　When two waves of slightly different frequencies interfere with one another, they produce a “beating” interference pattern that alternates between constructive (in-phase) and destructive (out-of-phase). In the case of sound waves, this sort of interference makes a “wa-wa-wa” sound, and the frequency of the beats is equal to the difference in the frequencies of the two interfering waves.

　　Beta decay

　　A form of radioactive decay where a heavy element ejects a beta particle and a neutrino, becoming a lighter element in the process.

　　Beta particle

　　A particle, identical to an electron. Beta particles are ejected from an atom in the process of beta decay.

　　Bohr atomic model

　　A model for the atom developed in 1913 by Niels Bohr. According to this model, the electrons orbiting a nucleus can only orbit at certain particular radii. Excited electrons may jump to a more distant radii and then return to their ground state, emitting a photon in the process.

　　Boiling point

　　The temperature at which a material will change phase from liquid to gas or gas to liquid.

　　Boyle’s Law

　　For a gas held at a constant temperature, pressure and volume are inversely proportional.

　　小编提醒：单词的记忆要靠长期的坚持，考生们一定要持之以恒，每天都拿出来看一看背一背，让这些词汇在大脑中形成长期记忆，这样就不会轻易地忘记背过的词汇了。

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