IB DP Physics: SL復習筆記7.2.3 Nuclear Fission & Fusion
Nuclear Fission & Fusion Nuclear Fusion Fusion is defined as: The joining of two small nuclei to produce a larger nucleus Low mass nuclei (such as hydrogen and helium) can undergo fusion and re...
2022年英國大學畢業(yè)生收入排行榜！什么大學和專業(yè)畢業(yè)薪資最高？
近日，英國求職網站Adzuna分析了2019年至2022年間上傳至系統(tǒng)的12萬多份求職簡歷，對英國大學畢業(yè)生畢業(yè)5年后的平均收入進行了排名。 根據這份排名，Adzuna整理出了全英畢業(yè)生收入最高的20所和最低的5所大學。一起...
IB DP Physics: SL復習筆記7.2.2 Mass Defect & Nuclear Binding Energy
Mass Defect & Nuclear Binding Energy Energy & Mass Equivalence Einstein showed in his?Theory of Relativity?that matter can be considered a form of energy and hence, he proposed: Mass can be...
IB DP Physics: SL復習筆記7.2.1 Atomic Mass Unit
Atomic Mass Unit The unified atomic mass unit?u?is roughly equal to the mass of one proton or neutron: 1u?= 1.66 × 10?27?kg It is sometimes abbreviated to?a.m.u This value will be given on your dat...
IB DP Physics: SL復習筆記7.1.9 Investigating Half-Life
Investigating Half-Life Aim of the Experiment The aim of the experiment is to investigate the half-life of a decaying radioactive sample This can be done with a live sample if safe access is availa...
IB DP Physics: SL復習筆記7.1.8 Half-Life
Half-Life It is impossible to know when a particular unstable nucleus will decay But the?rate?at which the activity of a sample decreases can be known This is known as the?half-life Half-life is de...
IB DP Physics: SL復習筆記7.1.7 Decay Equations
Decay Equations Changes in N and Z by Radioactive Decay There are four reasons why a nucleus might become unstable, and these determine which decay mode will occur Too many neutrons Decays through?...
IB DP Physics: SL復習筆記7.1.6 Alpha, Beta & Gamma Particles
Alpha, Beta & Gamma Particles Some elements have nuclei that are unstable This tends to be when the number of nucleons does not balance In order to become more stable, they emit particles and/o...
IB DP Physics: SL復習筆記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復習筆記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復習筆記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復習筆記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?=?...
