CIE A Level Physics复习笔记23.2.3 Half-Life
Half-Life Definition Half life is defined as: The time taken for the initial number of nuclei to reduce by half This means when a time equal to the half-life has passed, the activity of the sample ...
CIE A Level Physics复习笔记23.2.2 Activity & The Decay Constant
Activity & The Decay Constant Since radioactive decay is spontaneous and random, it is useful to consider the average number of nuclei which are expected to decay per unit time This is known as...
CIE A Level Physics复习笔记23.2.1 The Random Nature of Radioactive Decay
The Random Nature of Radioactive Decay Radioactive decay is defined as: The spontaneous disintegration of a nucleus to form a more stable nucleus, resulting in the emission of an alpha, beta or gam...
CIE A Level Physics复习笔记23.1.5 Calculating Energy Released in Nuclear Reactions
Calculating Energy Released in Nuclear Reactions The binding energy is equal to the amount of energy released in forming the nucleus, and can be calculated using: E = (Δm)c2 Where: E = Binding ener...
CIE A Level Physics复习笔记23.1.4 Nuclear Fusion & Fission
Nuclear Fusion & Fission Nuclear Fusion Fusion is defined as: The fusing together of two small nuclei to produce a larger nucleus Low mass nuclei (such as hydrogen and helium) can undergo fusio...
CIE A Level Physics复习笔记23.1.3 Mass Defect & Binding Energy
Mass Defect & Binding Energy Experiments into nuclear structure have found that the total mass of a nucleus is less than the sum of the masses of its constituent nucleons This difference in mas...
CIE A Level Physics复习笔记23.1.2 Nuclear Equations
Representing Simple Nuclear Reactions Nuclear reactions can be represented by balanced equations of nuclei in the AZX form AZX notation for atomic nuclei The top number A represents the nucleon num...
CIE A Level Physics复习笔记23.1.1 Energy & Mass Equivalence
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 converted into energy Energy can be conv...
CIE A Level Physics复习笔记22.3.3 Calculating Discrete Energies
Calculating Discrete Energies The difference between two energy levels is equal to a specific photon energy The energy (hf) of the photon is given by: ΔE = hf = E2 - E1 Where, E1 = Energy of the hi...
