在 Threads 查看
“`html
Mechanics • 電學 • 波動
三大難題攻破技巧
HKDSE Physics 專科補習 • Physics Concepts 徹底掌握
中大・港大名師團隊
攻破 HKDSE Physics 三大核心難題
朗林物理針對 Mechanics、電學（Electricity）及波動（Waves）三大高頻考點，設計專屬解題框架，助你由概念到應用全面突破。
5 道經典難題 + 詳細題解
2025 最新考向
Mechanics：A projectile is launched at 25 m s⁻¹ at 35° to the horizontal. Calculate the maximum height reached.
使用垂直分量：vᵧ = u sinθ = 25 × sin35° ≈ 14.34 m s⁻¹
最高點時 vᵧ = 0，h = vᵧ² / (2g) = (14.34)² / (2×9.81) ≈ 10.45 m
Electricity：Three resistors 4Ω, 6Ω and 12Ω are connected in parallel. Find the effective resistance.
1/R = 1/4 + 1/6 + 1/12 = 0.25 + 0.1667 + 0.0833 = 0.5
R = 2 Ω
Waves：Two coherent sources are 0.6 m apart. Find the position of the 3rd bright fringe at 2.4 m away (λ = 550 nm).
yₙ = nλD/d = 3 × 550×10⁻⁹ × 2.4 / 0.6 = 6.6 mm
Mechanics：A 0.5 kg mass on a spring (k = 200 N m⁻¹) is displaced 0.08 m. Find maximum velocity.
vₘₐₓ = Aω = 0.08 × √(k/m) = 0.08 × √400 = 1.6 m s⁻¹
Electricity + Waves：A capacitor in an LC circuit oscillates at 500 Hz. If L = 0.2 H, calculate C.
f = 1/(2π√LC) → C = 1/(4π²f²L) = 1/(4π²×250000×0.2) ≈ 5.07 μF
#Mechanics
#Electricity
#Waves
#PhysicsTuitionHK
English Version
Master the three toughest HKDSE Physics topics — Mechanics, Electricity and Waves — with proven problem-solving frameworks. Our structured approach helps students achieve Level 5** through deep conceptual understanding and exam-focused techniques.
朗林物理 — 學生成績與補習特點
補習社特點
- 中大港大名師小班教學
- 概念 + 技巧雙軌並進
- 真人面對面 + Zoom 同步
- 每月模擬試卷 + 詳細講解
專責 Mechanics 及 Waves 模組，擅長以圖像化方式講解複雜運動及波動現象。
專責電學及現代物理，多年 DSE 考試命題研究經驗，助學生掌握高分技巧。
4 大教學地點
“`