IB DP Biology: SL復(fù)習(xí)筆記1.1.1 Cell Theory
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...
IB DP Physics: HL復(fù)習(xí)筆記12.2.7 Measuring Half-Life
Measuring Half-Life Half-life is defined as: The time taken for the initial number of nuclei to halve for a particular isotope This means when a time equal to the half-life has passed, the?activity...
IB DP Physics: HL復(fù)習(xí)筆記12.2.6 The Law of Radioactive Decay
The Law of Radioactive Decay Since radioactive decay is spontaneous and random, it is useful to consider the average number of nuclei which are expected to decay per unit of time This is known as t...
IB DP Physics: HL復(fù)習(xí)筆記12.2.5 The Neutrino
The Neutrino An electron neutrino is a type of subatomic particle with no charge and negligible mass which is also emitted from the nucleus The anti-neutrino is the antiparticle of a neutrino Elect...
IB DP Physics: HL復(fù)習(xí)筆記12.2.4 Nuclear Energy Levels
Nuclear Energy Levels In the same way that electrons can exist in excited states, nuclei can also exist in?excited states After an unstable nucleus emits an alpha particle, beta particle or undergo...
IB DP Physics: HL復(fù)習(xí)筆記12.2.3 Deviations from Rutherford Scattering
Deviations from Rutherford Scattering In the Rutherford scattering experiment, alpha particles are fired at a thin gold foil Some of the alpha particles are found to come straight back from the gol...
IB DP Physics: HL復(fù)習(xí)筆記12.2.2 Nuclear Scattering
Nuclear Scattering Electrons accelerated to close to the speed of light have wave-like properties such as the ability to diffract and have a ?de Broglie wavelength?equal to: Where: h?=?Planck's con...
IB DP Physics: HL復(fù)習(xí)筆記12.2.1 Rutherford Scattering & Nuclear Radius
Rutherford Scattering & Nuclear Radius In the Rutherford scattering experiment, alpha particles are fired at a thin gold foil Initially, before interacting with the foil, the particles have kin...
IB DP Physics: HL復(fù)習(xí)筆記12.1.10 Tunnelling
Tunnelling Single potential wells?lead to quantised energy levels and their associated?wavefunctions The wavefunction extends throughout space However, for?infinitely deep square wells?the wavefunc...
如何選擇適合自己的AP課程？AP選課指南請收好
為了向大學(xué)招生官展示你的學(xué)術(shù)能力，在高中期間選修AP課程很重要，而AP課程門類繁多，如果沒有明確的目標(biāo)專業(yè)，選課會令人感到非常頭禿。在很多成功的申請案例中，有手握十幾門AP 5分的學(xué)生，也有只考一兩門AP的...
IB DP Physics: HL復(fù)習(xí)筆記12.1.9 The Uncertainty Principle
The Uncertainty Principle The quantisation of energy levels and their associated wave functions leads to some surprising outcomes One of these outcomes is known as the?uncertainty principle The unc...
IB DP Physics: HL復(fù)習(xí)筆記12.1.8 The Wave Function
The Wave Function Bohr?showed that the angular momentum of an electron orbiting a hydrogen atom was?quantised He also showed that the allowed electron energies were also quantised Unfortunately, th...
