IB DP Physics: SL复习笔记7.1.5 Background Radiation
Background Radiation It is important to remember that radiation is a natural phenomenon Radioactive elements have always existed on Earth and in outer space However, human activity has added to the...
IB DP Physics: SL复习笔记7.1.4 Isotopes & Radioactive Decay
Isotopes AZX Notation A nuclide is a group of atoms containing the same number of protons and neutrons For example, 5 atoms of oxygen are all the same nuclide but are 5 separate atoms Atomic symbol...
IB DP Physics: SL复习笔记7.1.3 Emission & Absorption Spectrum
Emission & Absorption Spectrum Line Spectra Line spectra is a phenomenon that occurs when excited atoms emit light of certain wavelengths which correspond to different colours This comes from d...
IB DP Physics: SL复习笔记7.1.2 Calculating Discrete Energies
Transitions Between Energy Levels Difference in discrete energy levels The difference between two energy levels is equal to a specific photon energy The energy (hf) of the photon is given by: ΔE = ...
IB DP Physics: SL复习笔记7.1.1 Discrete Energy Levels
Discrete Energy Levels The Photon Model Photons are fundamental particles that make up all forms of electromagnetic radiation A photon is a massless “packet” or a “quantum” of electromagnetic energ...
IB DP Physics: SL复习笔记6.2.3 Gravitational Field Strength
Gravitational Field Strength There is a universal force of attraction between all matter with mass This force is known as the ‘force due to gravity’ or the weight The Earth’s gravitational field is...
IB DP Physics: SL复习笔记6.2.2 Circular Orbits
Circular Orbits Since most planets and satellites have a near circular orbit, the gravitational force FG between the sun or another planet provides the centripetal force needed to stay in an orbit ...
AP美国史考察内容解读，应该如何备考？
相信很多中国学生对AP美国历史并不是很感兴趣，认为枯燥且难，学了也拿不上高分。但其实，作为一门“偏文”的AP科目，学好AP美国历史不仅能展示出学生的学术能力，还可体现出申请者是一个敢于挑战，全面发展的学生...
IB DP Physics: SL复习笔记6.2.1 Newton’s Law of Gravitation
Newton's Law of Gravitation The gravitational force between two bodies outside a uniform field, e.g. between the Earth and the Sun, is defined by Newton’s Law of Gravitation Recall that the mass of...
