Edexcel IGCSE Geography 复习笔记 1.1.1 The Hydrological Cycle Characteristics of the Water Cycle The hydrological cycle is a closed system Water is constantly recycled through the system Within the...
清华、北大作为国内最优秀的两所高校 就如同美国的哈佛大学与MIT 是无数学生梦寐以求的学府 从这4所学校毕业的学生 未来发展、就业去向有何不同呢？ 01直接就业 OR 学习深造？ 在这个问题上，4所高校的毕业生选择...
Emergent Properties Multicellular organisms are able to undertake functions that unicellular organisms cannot, e.g. move over vast distances and digest large macromolecules Scientists sometimes sum...
Surface Area to Volume Ratio Materials constantly being exchanged across the plasma membrane The volume/mass of cytoplasm (as this is where the reactions take place)For cells to survive, metabolic ...
Functions of Life Unicellular (single-celled) and multicellular (many cells) organisms must carry out the following functions to stay alive: Metabolism - all the enzyme-catalysed reactions occurrin...
Cell Theory Until microscopes became powerful enough to view individual cells, no-one knew for certain what living organisms were made from A scientist called Robert Hooke came up with the term "ce...
Edexcel IGCSE Physics 复习笔记 8.3.3 Galactic Red-shift Galactic Red-shift The Doppler effect affects all types of waves, including light Light emitted from stars and galaxies will be at a c...
Edexcel IGCSE Physics 复习笔记 8.3.2 Doppler Shift The Doppler Effect Usually, when an object emits waves, the wavefronts spread out symmetrically If the wave source moves, the waves can bec...
Edexcel IGCSE Physics 复习笔记 8.3.1 The Big Bang Theory The Big Bang Theory Around 14 billion years ago, the Universe began from a very small region that was extremely hot and dense Then th...
Edexcel IGCSE Physics 复习笔记 8.2.5 Hertzsprung-Russell Diagrams Hertzsprung-Russell Diagrams Stars are classified using the Hertzsprung-Russell (HR) diagram This is a plot of: The luminosi...
Edexcel IGCSE Physics 复习笔记 8.2.4 The Brightness of Stars Absolute Magnitude Astronomers measure the brightness of stars at a standard distance using the absolute magnitude scale This is ...
Euler's Method: Second Order How do I apply Euler’s method to second order differential equations? A second order differential equation is a differential equation containing one or more second deri...
