Alevel物理（quantum physics）部分知识点讲解！

　　Alevel物理这门课程涉及到较多的板块，板块不同，涉及到的概念知识点也很多。下面，为大家讲解Alevel物理（quantum physics）知识点讲解！具体详情如下：

Alevel物理的考试难度

　　Alevel物理AS的时候物理需要考Paper1、2、3，A2的时候需要考Paper4、5。Paper1是选择题，Paper2、4是大题，Paper3、5是实验题。相对来说，paper2比较困难，因为题目的灵活性比较强，涉及到的概念比较多。

quantum physics and nuclear physics

　　the definition of key vocabularies.

　　Particle model:objects that are hard, have mass and move about according to laws of Newtonian mechanics

　　Wave model:shaped like a sine graph, do not have mass or charge. Their defining characteristics are diffraction and interference

　　Photoelectric effect: when an electromagnetic radiation of sufficiently high frequency falls on a metal 　　surface, electrons are emitted and the emitted electrons are 

　　called photoelectrons 

　　Photoelectric current: current due to photoelectrons 

　　Photon: each quantum (particle) of electromagnetic radiation 

　　Work function: minimum amount of energy required by an electron to escape its surface

　　Matter wave:a moving particle of matter of momentumwill have an associated wave of wavelengthwhere

　　Under normal conditions, an atom is in itsground statewhere it posses the minimum possible energy

　　Transition: shifting of electrons between energy levels

　　Mass defect :the difference between the total mass of the individual, separate nucleons and the mass of the nucleus

　　Binding energy : the minimum external energy required to separate all the neutrons and protons of a nucleus. It is also the energy released when the nucleus is assembled from its constituent nucleons

　　-Binding energy per nucleonof a nucleus is the ratio of the total binding energy to its nucleon number

　　Fission:process in which a massive nucleus splits to form two smaller fragments-Fusion:process by which two very light nuclei join together to form a heavier nucleus

　　Random:impossible to predict and each nucleus has the same probability of decaying per unit time

　　Spontaneous:not affected by external factors such as the presence of other nuclei, temperature and pressure

　　Theactivityof a radioactive sample is the rate at which nuclei decay or disintegrate

　　Thedecay constantis the probability that an individual nucleus will decay per unit time interval

　　Thehalf lifeof a radioactive is the mean time taken for half of the active nuclei in a sampleto decay

　　上述就是对大家讲解的“Alevel物理（quantum physics）部分知识点讲解！”。想要自身的Alevel课程成绩脱颖而出，可以点击本网站Alevel同步辅导预约试听课程。

扫描下方二维码，可以领取Alevel课程历年的考试真题学习资料