Edexcel IGCSE Maths 复习笔记 1.15.1 Best Buy
Edexcel IGCSE Maths 复习笔记 1.15.1 Best Buy How do you tackle “Best Buy” problems? You may need a range of skills… Decide on a suitable comparison – eg total cost, cost/year, cost/m2 etc) Be consi...
AQA A Level Physics复习笔记2.5.1 Collisions of Electrons with Atoms
Ionisation & Excitation Ionisation of an atom is: The removal, or addition, of an electron from, or to, an atom when given sufficient energy Excitation of electrons is: When an electron ...
AQA A Level Physics复习笔记2.4.1 The Electronvolt
The Electronvolt The electronvolt is a unit which is commonly used to express very small energies This is because quantum energies tend to be much smaller than 1 Joule The electronvolt is de...
AQA A Level Physics复习笔记2.3.1 The Four Fundamental Interactions
The Four Fundamental Interactions There are four fundamental interactions, or fundamental forces, that exist. These are: Gravity Electromagnetism Strong Nuclear (or Strong Interaction) Weak ...
Edexcel IGCSE Maths复习笔记 1.14.1 Exchange Rates
Edexcel IGCSE Maths复习笔记 1.14.1 Exchange Rates Simplifying exchange rate questions Use ratios! Put exchange rates in ratio form (use more than one line if necessary) Add lines for prices/costs U...
AQA A Level Physics复习笔记2.2.1 Hadrons
Baryons & Mesons Hadrons Hadrons are the group of subatomic particles that are made up of quarks Therefore, hadrons can feel the strong nuclear force There are two classes of hadrons: Ba...
AQA A Level Physics复习笔记2.1.1 Atomic Structure
Atomic Structure The atoms of all elements are made up of three types of particles: protons, neutrons and electrons. Protons and neutrons are found in the nucleus of an atom while electrons ...
AQA A Level Physics复习笔记1.1.1 SI Units
SI Base Quantities There is a seemingly endless number of units in Physics These can all be reduced to six base units from which every other unit can be derived These seven units are referre...
AQA A Level Physics复习笔记1.2.1 Sources of Uncertainty
Random & Systematic Errors Measurements of quantities are made with the aim of finding the true value of that quantity In reality, it is impossible to obtain the true value of any quanti...
2022纽约时报中学生社论竞赛详解，获奖作品将在纽约时报刊登、全球发表！
国际社会风云变幻的今天，对于时事热点话题分享个人见解、加以评论正在成为新一代世界公民的必备素养，大名鼎鼎的纽约时报系列比赛之社论学术活动已经拉开帷幕，优秀的你还不快上车？ 有什么事情使你愤怒？ 你希...
AQA A Level Chemistry复习笔记8.1.1 Required Practical 7
Required Practical 7 Required Practical 7: Measuring the rate of a reaction There are two ways to measure the rate of reaction By an initial rate method By a continuous monitoring method &nb...
Edexcel IGCSE Maths复习笔记 1.13.2 Standard Form - Harder
Edexcel IGCSE Maths复习笔记 1.13.2 Standard Form - Harder Standard form – harder questions Make sure you are familiar with:Roots & Indices – Basics Standard Form – Basics Harder problems often ...
