Alevel物理 粒子 波 力学 电 场 核 备考规划
A-Level AQA Physics covers 8 core topics across 2 years, tested in 3 papers worth 250 marks total. From quantum particles to gravitational fields, from wave interference to nuclear instability, the syllabus demands both conceptual depth and mathematical fluency. Alevel AQA物理横跨2年8大核心模块，3张试卷250分，从量子粒子到引力场，从波的干涉到核不稳定性，既考概念深度又考数学熟练度。
This studyplan breaks down every topic, shows you where to focus, and maps out a 6-week revision programme to secure that A*. 这篇备考规划拆解每个模块的重点难点，标注高频考点，并给出6周冲刺计划，帮你锁定A*。
1. Exam Overview 考试概览
AQA Physics (7408) has three papers with no coursework. The 12 required practicals are assessed within the written papers via indirect questions on method, data analysis, and uncertainty. AQA物理7408共三张试卷，无课程作业，12个必做实验通过试卷中的实验方法、数据分析和不确定度问题间接考查。
Paper 1 (2h, 85 marks, 34%): Sections 1-5 plus Periodic Motion (6.1). 60 marks short/long + 25 marks multiple choice. Covers Particles, Waves, Mechanics, Materials, Electricity. Paper 2 (2h, 85 marks, 34%): Sections 6.2 (Thermal) + 7 (Fields) + 8 (Nuclear). Same 60/25 split. Paper 3 (2h, 80 marks, 32%): Section A (45 marks) practical skills and data analysis, Section B (35 marks) on your optional topic. 试卷一考粒子和辐射、波、力学、电学；试卷二考热物理、场、核物理；试卷三考实验技能和选修专题。
2. Particles and Radiation 粒子与辐射
This is the quantum foundations module. Start with the Standard Model: six quarks (up/down/charm/strange/top/bottom) and six leptons (electron/muon/tau plus their neutrinos). Hadrons are quark-bound (baryons = 3 quarks, mesons = quark-antiquark). Leptons are fundamental. 标准模型的六种夸克和六种轻子是基础：强子由夸克组成（重子=3夸克，介子=夸克反夸克对），轻子是基本粒子。
Conservation laws are the engine of every particle interaction question. Check: charge (Q), baryon number (B), lepton number (Le, Lμ, Lτ separately), strangeness (S) which is conserved in strong but not weak interactions. A strange particle decaying via the weak force changes S by ±1. 守恒定律是粒子相互作用题的核心：电荷Q、重子数B、轻子数L（三代分别守恒）、奇异数S（强相互作用守恒，弱相互作用可改变±1）。
The photoelectric effect: hf = Φ + KEmax. Key insight that catches students off guard: intensity affects the number of photoelectrons (current), but only frequency above the threshold affects whether emission happens at all. The stopping potential Vs relates directly to KEmax = eVs, giving a clean experimental method to measure h. 光电效应方程hf=Φ+KEmax：光强影响光电子数量（电流），但只有频率超过阈频才能产生光电发射。截止电压Vs直接关联KEmax=eVs，是测量普朗克常数h的经典实验方法。
Wave-particle duality and electron diffraction confirm de Broglie's λ = h/p = h/mv. The electron diffraction tube experiment shows rings corresponding to crystal plane spacings: λ = h/√(2meV) for electrons accelerated through potential V. 德布罗意波长λ=h/p=h/mv，电子衍射管实验显示与晶面间距对应的衍射环，加速电压V下的电子波长λ=h/√(2meV)。
3. Waves and Optics 波与光学
Progressive vs stationary waves is the #1 AQA differentiator. Progressive: energy transfers, phase varies with position. Stationary: no net energy transfer, all points between nodes oscillate in phase (with varying amplitude), formed by superposition of two identical waves travelling in opposite directions. Node spacing = λ/2. 行波和驻波是AQA必考区分点：行波传递能量、相位随位置变化；驻波无净能量传递、两节点间所有点同相振动（振幅不同），由两列相同波相向叠加而成，节点间距λ/2。
Interference demands path difference in wavelength units. Young's double-slit: w = λD/s. The diffraction grating equation d sinθ = nλ gives sharper maxima. For thin-film interference, remember the phase change of π (equivalent to λ/2) on reflection at a boundary with higher refractive index. 杨氏双缝w=λD/s，光栅方程d sinθ=nλ给出更锐利的极大值。薄膜干涉注意从高折射率界面反射时有π相位变化（等效λ/2光程差）。
Refraction: n = sin i / sin r = c1/c2. Total internal reflection when i > critical angle, where sin C = 1/n. Optical fibres use TIR with a cladding layer (lower n) to protect the core signal. Snell's Law is tested in both calculation and explanation contexts. 折射定律n=sini/sinr=c1/c2；全内反射条件i>临界角C，sinC=1/n；光纤利用TIR原理，包层折射率低于纤芯以保护信号。
4. Mechanics and Materials 力学与材料
SUVAT is the non-negotiable starting point. All five equations assume constant acceleration. The most common exam mistake: applying SUVAT to problems where acceleration changes (e.g., a rocket burning fuel and losing mass, or air resistance that varies with speed). Check the "constant a" condition before writing any equation. Use motion graphs (v-t, s-t) as a cross-check. SUVAT五方程是力学起点，前提是匀加速度。最常见的考试错误：将SUVAT用于加速度变化的情况。画运动图像（v-t图、s-t图）作为交叉验证。
Newton's laws in practice. First: equilibrium means ΣF = 0. Second: F = ma, the one equation you will use most. Third: action-reaction pairs act on different bodies and are the same type of force. Draw free-body diagrams. For connected particles, write separate equations per body and solve simultaneously. 牛顿三定律实战：第一定律ΣF=0即平衡；第二定律F=ma使用频率最高；第三定律作用力与反作用力作用在不同物体上且属同类型力。连接体问题对每个物体分别列方程联立求解。
Materials: stress σ = F/A, strain ε = ΔL/L, Young modulus E = σ/ε. The stress-strain graph distinguishes elastic (obeys Hooke's Law, linear), plastic (permanent deformation), and brittle (no plastic region) behaviour. Energy stored = area under force-extension graph = ½FΔL for Hookean materials. Key practical: measure Young modulus of a wire using a travelling microscope and vernier scale. 应力σ=F/A、应变ε=ΔL/L、杨氏模量E=σ/ε。应力应变图区分弹性（服从胡克定律、线性）、塑性（永久变形）和脆性（无塑性区）。储存能量=力伸长图下方面积。重点实验：用游标尺和移动显微镜测金属丝杨氏模量。
Momentum: p = mv, always conserved in collisions. Impulse = FΔt = Δp = area under F-t graph. Elastic: KE conserved. Inelastic: KE not conserved (but momentum still is). Explosions: total p = 0 before and after. 动量p=mv，碰撞中始终守恒。冲量FΔt=Δp=F-t图下方面积。弹性碰撞动能守恒；非弹性碰撞动能不守恒（但动量仍守恒）。爆炸：前后总动量均为0。
5. Electricity 电学
Circuit analysis is systematic, not intuitive. Define current direction, label all currents, write Kirchhoff's laws: (1) ΣIin = ΣIout at any junction; (2) Σε = ΣIR around any closed loop. For potential dividers, Vout = Vin × R2/(R1+R2). When a component's resistance changes (thermistor, LDR), the potential divider redistributes voltage: this is the most examined application. 电路分析是系统性工作而非直觉：标定电流方向，基尔霍夫第一定律节点电流代数和为零，第二定律闭合回路电动势代数和等于电压降代数和。分压器Vout=Vin×R2/(R1+R2)是最常用的考题模式。
Resistivity ρ = RA/L. Know how to determine it experimentally: measure V and I for a wire of known length and diameter, plot R vs L, gradient = ρ/A. Superconductivity: below critical temperature Tc, R drops to exactly zero. Usually Tc is very low (e.g., 4K for mercury) but high-temperature superconductors (e.g., YBCO at ~90K) are an AQA talking point. 电阻率ρ=RA/L，实验测法：测已知长度和直径导线的V和I，画R-L图，斜率为ρ/A。超导：温度低于临界温度Tc时电阻突降为零，高温超导体（如YBCO约90K）是AQA考点。
EMF ε = I(R+r) and internal resistance. The terminal pd V = ε - Ir. To measure r: vary the external resistance, record V and I, plot V against I. The y-intercept = ε, gradient = -r. Power: P = IV = I²R = V²/R. Efficiency = useful power out / total power in. 电动势ε=I(R+r)、内阻r，端电压V=ε-Ir。测r实验：改变外电阻记录V和I，画V-I图，y截距=ε、斜率=-r。功率P=IV=I²R=V²/R，效率=有用输出功率/总输入功率。
6. Fields: Gravitational, Electric, Magnetic 场：引力、电场、磁场
Gravitational fields: g = F/m (vector), Vg = -GM/r (scalar). g = GM/r² for a point mass. g is the negative gradient of potential: g = -dVg/dr, and the area under a g-r graph gives the change in potential. Escape velocity: vesc = √(2GM/R). Orbit: centripetal force mv²/r = gravitational force GMm/r², giving v = √(GM/r) and T² ∝ r³ (Kepler's Third Law). 引力场g=F/m(矢量)，引力势Vg=-GM/r(标量)。g为势的负梯度g=-dVg/dr，g-r图下方面积给出势的变化。逃逸速度vesc=√(2GM/R)。轨道：向心力mv²/r=引力GMm/r²，得v=√(GM/r)和T²∝r³。
Electric fields: E = F/q (vector), V = Q/4πε₀r (scalar). For a uniform field between parallel plates: E = V/d. For a point charge: E = Q/4πε₀r². Path independence of electric potential is tested in comparison with gravitational fields. Coulomb's Law F = Q₁Q₂/4πε₀r² mirrors Newton's gravitational law structurally but is approximately 10³⁶ times stronger. 电场E=F/q(矢量)，电势V=Q/4πε₀r(标量)。均匀电场（平行板）E=V/d，点电荷E=Q/4πε₀r²。电势的路径无关性与引力场对比是考频高的题目。库仑定律F=Q₁Q₂/4πε₀r²在结构上与万有引力定律对称，但强度约大10³⁶倍。
Magnetic fields: F = BIL sinθ, F = BQv sinθ. Fleming's left-hand rule for motor effect. Charged particles in magnetic fields execute circular motion: r = mv/BQ, T = 2πm/BQ (independent of speed, which is why a cyclotron works). The Hall effect: VH = BI/nqt, letting you measure B or determine charge carrier density n. 磁场力F=BILsinθ=F=BQvsinθ，弗莱明左手定则。带电粒子在磁场中做圆周运动r=mv/BQ，周期T=2πm/BQ（与速度无关，回旋加速器原理）。霍尔效应VH=BI/nqt可测B或载流子密度n。
Electromagnetic induction: ε = -N(dΦ/dt). Faraday's Law with Lenz's Law (minus sign = induced current opposes the change causing it). Flux linkage = NΦ = NBA cosθ. Four ways to change flux: move magnet, change area, rotate coil, change B. The AC generator (alternator) is the rotating-coil application, producing ε = BANω sin(ωt). 电磁感应ε=-N(dΦ/dt)，法拉第定律加楞次定律（负号=感应电流方向阻碍磁通变化）。磁链NΦ=NBAcosθ。改变磁通的四种方式：移动磁铁、改变面积、旋转线圈、改变B。交流发电机是旋转线圈应用，输出ε=BANω sin(ωt)。
7. Nuclear Physics 核物理
Rutherford scattering proved the nuclear model. Most alpha particles passed straight through gold foil, but about 1 in 8000 deflected >90°. This demanded: (a) nucleus is tiny (~10⁻¹⁵ m vs atom ~10⁻¹⁰ m), (b) mass and positive charge are concentrated in the nucleus, (c) most of the atom is empty space. 卢瑟福散射实验证实核模型：大多数α粒子径直穿过金箔，但约1/8000偏转>90°，证明原子核极小（~10⁻¹⁵m 对原子~10⁻¹⁰m），质量和正电荷集中于核内。
Radioactivity: α, β⁻, β⁺, and γ. Alpha: ⁴₂He nucleus, range ~5cm in air, highly ionising (knocks ~10⁵ electrons off per mm). Beta-minus: n -> p + e⁻ + ν̄e, moderate ionisation (~10³ electrons/mm). Beta-plus: p -> n + e⁺ + νe, annihilates with electron producing two 511 keV photons. Gamma: EM wave, weakly ionising, stopped by thick lead or concrete. 放射性：α粒子（⁴₂He核，空气中射程~5cm，强电离~10⁵电子/mm）；β⁻衰变n->p+e⁻+ν̄e，中等电离；β⁺衰变p->n+e⁺+νe，正电子与电子湮灭产生两个511keV光子；γ射线为电磁波，弱电离，厚铅板或混凝土可阻挡。
Exponential decay: N = N₀e^(-λt), half-life T½ = ln2/λ. Activity A = λN, also decays exponentially. The decay constant λ is the probability of decay per unit time per nucleus. Nuclear radius R = r₀A^(1/3) where r₀ ≈ 1.2 fm, confirming constant nuclear density. Fission: a heavy nucleus splits; fusion: light nuclei combine. Binding energy per nucleon peaks at iron-56 (~8.8 MeV). 指数衰变N=N₀e^(-λt)，半衰期T½=ln2/λ，活度A=λN也指数衰减。核半径R=r₀A^(1/3)，r₀≈1.2fm，验证核密度恒定。裂变是重核分裂，聚变是轻核结合。比结合能在铁56处最大(~8.8MeV)。
8. Six-Week Revision Plan 六周复习计划
Week 1 第一周
Particles + Radiation
Standard Model, conservation laws, photoelectric effect, wave-particle duality. Past paper: Paper 1 Section A. 标准模型、守恒律、光电效应、波粒二象性。刷试卷一A部分。
Week 2 第二周
Waves + Optics
Progressive vs stationary, Young's slits, diffraction grating, refraction + TIR. Required practicals: double-slit, grating. 行波与驻波、双缝干涉、光栅、折射全反射。完成双缝和光栅实验复习。
Week 3 第三周
Mechanics + Materials
SUVAT, Newton's laws, momentum, materials (Young modulus). Required practicals: g by free-fall, Young modulus. 运动学、牛顿定律、动量、材料力学。完成自由落体测g和杨氏模量实验复习。
Week 4 第四周
Electricity + Fields
Circuit analysis, potential dividers, EMF + internal resistance, gravitational/electric/magnetic fields. Paper 2 practice. 电路分析、分压器、电动势内阻、引力/电场/磁场。练试卷二。
Week 5 第五周
Nuclear + Option Topic
Rutherford, radioactivity, decay, fission/fusion + your optional module. Paper 2 and 3 Section B. 卢瑟福散射、放射性、衰变、裂变聚变+选修模块。练试卷二和三B部分。
Week 6 第六周
Full Mock Exams 全真模拟
3 timed full papers, mark and analyse every mistake. Revisit weakest 2 topics. Practical question drill for Paper 3A. 三套限时全真模拟，批改分析每个错误，回攻最弱2个模块，专项练试卷三A实验题。
9. Exam Tips and Common Traps 考试技巧与易错点
Command Words 指令词
State: give the answer, no explanation. Describe: say what happens. Explain: say why it happens (causes, mechanisms). Calculate/Determine: show full working. Suggest: apply physics principles to an unfamiliar context. 区分指令词：State只需答案，Describe说发生了什么，Explain说为什么发生，Calculate/Deterime展示完整步骤，Suggest将物理原理应用到不熟悉的情境。
6-Mark Questions 六分大题
Use the PEEL structure: Point, Evidence, Explanation, Link. Plan 3 well-developed points with equations where relevant. Quality of written communication (QWC) is assessed: use correct terminology, logical sequence, and clear diagrams. PEEL结构：观点、证据、解释、联系。规划3个有深入展开的要点，适当引用公式。书写质量QWC计入评分：用准确术语、逻辑清晰、配示意图。
Top 5 Traps 五大陷阱
1. Forgetting that SUVAT requires constant acceleration. 2. Confusing baryon number conservation with strangeness conservation (strangeness is NOT conserved in weak interactions). 3. Using sinθ instead of cosθ in Φ=BAcosθ. 4. Missing the direction of induced EMF and current in Lenz's Law questions. 5. Confusing gravitational potential Vg=-GM/r (negative, scalar) with field strength g=GM/r² (vector).
10. Key Bilingual Terms 关键双语术语
Photoelectric effect 光电效应 | Work function 功函数 | Stopping potential 截止电压 | de Broglie wavelength 德布罗意波长 | Stationary wave 驻波 | Path difference 光程差 | Diffraction grating 衍射光栅 | Total internal reflection 全内反射 | Young modulus 杨氏模量 | Elastic limit 弹性极限 | Impulse 冲量 | Conservation of momentum 动量守恒 | Resistivity 电阻率 | Superconductivity 超导 | Internal resistance 内阻 | EMF 电动势 | Gravitational potential 引力势 | Escape velocity 逃逸速度 | Electric field strength 电场强度 | Coulomb's Law 库仑定律 | Magnetic flux density 磁通密度 | Faraday's Law 法拉第定律 | Lenz's Law 楞次定律 | Flux linkage 磁链 | Decay constant 衰变常数 | Half-life 半衰期 | Binding energy 结合能 | Mass defect 质量亏损 | Fission 裂变 | Fusion 聚变
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