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3334 題 中學 8/7/2026
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免費體驗 20 題A family compares a resistive ceramic hob with a magnetic induction hob. Evaluate the following claims and justify which of them are physically valid. (1) In each appliance, thermal energy for cooking is ultimately produced by electric current in a conductor. (2) Both appliances must be supplied with alternating current in order to heat normally. (3) Both appliances require a ferromagnetic pan before any useful heating can occur. 一家人比較電阻式陶瓷電爐和磁感應爐。請評估以下陳述，指出哪些符合物理原理並作解釋。 (1) 在兩種電器中，煮食所需的熱能最終都是由導體中的電流產生。 (2) 兩種電器都必須使用交流電才可正常加熱。 (3) 兩種電器都必須使用鐵磁性鍋具才會產生有用的加熱。 Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
Near the Earth's orbit, the solar irradiance is about 1.40 x 10^3 W m^-2. Take the mean Sun-Earth distance as 1.50 x 10^11 m. Assuming the Sun radiates uniformly in all directions, estimate its total energy output per second. 在地球軌道附近，太陽輻照度約為 1.40 x 10^3 W m^-2。設太陽與地球的平均距離為 1.50 x 10^11 m。假設太陽向各方向均勻輻射，估算太陽每秒輸出的總能量。 Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
The table compares features of three vehicle types. Which row gives a correct comparison? 下表比較三種車輛的特徵。哪一列的比較正確？ Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
The diagram shows a small lamp at the top of a vertical pole of height H. The light ray from the lamp to point P on the horizontal ground makes an angle alpha with the pole. The lamp may be treated as a point source. The illuminance at P is directly proportional to which expression? 圖中顯示一盞小燈位於高度為 H 的垂直燈柱頂端。由小燈射到水平地面 P 點的光線與燈柱成 alpha 角。可把小燈視為點光源。P 點的照度與請評估以下項目，並用物理推理判斷所需結論。 Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
The diagram shows a forward-biased light-emitting diode. Evaluate the following claims and justify which of them are physically valid. (1) The p-side is connected to the positive terminal of the battery. (2) The p-type region has mobile holes as majority carriers, while the n-type region has mobile electrons as majority carriers. (3) Light is produced when electrons and holes recombine near the junction. 圖中顯示一個正向偏壓的發光二極管。請評估以下陳述，指出哪些符合物理原理並作解釋。 (1) p 端連接電池的正極。 (2) p 型區以可移動空穴為多數載流子，而 n 型區以可移動電子為多數載流子。 (3) 電子和空穴在接面附近復合時會產生光。 Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
A hostel uses an electric urn to heat 2.5 kg of water from 24°C to 100°C. Electricity costs $1.30 per kW h. Taking the specific heat capacity of water as 4200 J kg⁻¹ °C⁻¹, estimate the electricity cost for one heating cycle. 一間宿舍使用電熱水壺把 2.5 kg 的水由 24°C 加熱至 100°C。電費為每 kW h $1.30。已知水的比熱容為 4200 J kg⁻¹ °C⁻¹，估算完成一次加熱所需的電費。
In the circuit shown, a 3 Ω resistor is connected in series with a parallel combination of 6 Ω and 12 Ω. The battery has emf 12 V and negligible internal resistance. What is the current through the 6 Ω resistor? 在圖示電路中，一個 3 Ω 電阻與 6 Ω 及 12 Ω 的並聯組合串聯。電池電動勢為 12 V，內阻可忽略。流經 6 Ω 電阻的電流是多少？
Two long straight wires lie in the same plane and meet at N with an angle of 90° between them. Point P is on the angle bisector and PN = 30 cm. The currents are 2 A and 4 A in the directions shown. What is the magnitude of the resultant magnetic flux density at P? Express your answer as a multiple of μ0/(2π). 兩條長直導線位於同一平面，並在 N 處成 90° 夾角。P 位於角平分線上，PN = 30 cm。電流大小分別為 2 A 和 4 A，方向如圖。求 P 點的合磁通量密度大小，並以 μ0/(2π) 的倍數表示。
The two systems in the diagram deliver power to identical heaters rated 240 V, 600 W. In system A, the power is transmitted directly at the heater voltage. In system B, ideal transformers step the voltage up by a factor of 4 for transmission and step it down again at the heater. The total resistance of the transmission cables is the same in both systems. What is the ratio of cable power loss in system A to that in system B? 圖中兩個系統向相同的 240 V、600 W 電熱器供電。系統 A 以電熱器電壓直接輸電。系統 B 使用理想變壓器把輸電電壓升高 4 倍，再在電熱器前降回原來電壓。兩系統的輸電電纜總電阻相同。系統 A 與系統 B 的電纜功率損耗比是多少？
A positively charged particle enters a region between two parallel plates with speed v as shown. The electric field strength is 2.4 × 10^3 N C⁻¹ and a uniform magnetic field of 0.30 T is directed out of the page. The particle travels straight through the region. What is v? 一個帶正電粒子以速率 v 進入兩平行板之間的區域，如圖所示。電場強度為 2.4 × 10^3 N C⁻¹，均勻磁場為 0.30 T 且方向垂直紙面向外。粒子能直線通過該區域。求 v。 (a) Identify the relevant physics principle or model involved in the situation. (2 marks) (b) Explain how the principle applies to the given situation, using correct terminology. (2 marks) (c) Analyse the situation quantitatively or qualitatively, showing the key reasoning or calculation steps. (3 marks) (d) Evaluate one limitation, safety issue, application or improvement related to the situation. (3 marks)
A conducting rod slides to the right at a constant speed of 0.30 m s⁻¹ along two smooth parallel rails. The rails are 25 cm apart and are connected to a 3 Ω lamp. A uniform magnetic field of 4.0 T is directed into the page. What external force is required to keep the rod moving at constant speed? 一條導電棒沿兩條光滑平行金屬軌以 0.30 m s⁻¹ 的恆定速率向右滑動。兩軌相距 25 cm，並接上一個 3 Ω 燈泡。均勻磁場強度為 4.0 T，方向垂直紙面向內。需要多大的外力才能使導電棒保持恆速運動？
A radioactive tracer has a half-life of 6 hours. A sample currently contains 0.18 mg of the tracer. How much of the tracer was present 24 hours ago? 某放射性示蹤物的半衰期為 6 小時。某樣本現時含有 0.18 mg 該示蹤物。24 小時前樣本中有多少該示蹤物？ Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
Which statements about nuclear fusion in stars are correct? (1) Very high temperature is required so that hydrogen nuclei can overcome electrostatic repulsion. (2) A slow neutron must be absorbed before hydrogen nuclei can fuse. (3) Fusion is the main energy source of the Sun. 下列有關恆星中核聚變的陳述哪些正確？ (1) 需要極高溫度，使氫核能克服靜電斥力。 (2) 氫核必須先吸收一個慢中子才可聚變。 (3) 聚變是太陽的主要能量來源。 Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
The diagram shows four allowed energy levels of a hydrogen atom. A large number of identical atoms are first excited to n = 4. As the electrons return to n = 1, every possible downward transition between these four levels occurs somewhere in the sample. How many different photon energies may be observed in the emission spectrum? 下圖顯示氫原子的四個容許能級。大量相同原子先被激發至 n = 4。當電子返回 n = 1 時，在樣本中四個能級之間所有可能的向下躍遷均會出現。 發射光譜中可觀察到多少種不同的光子能量？ Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
A photovoltaic panel of area 1.8 m^2 is installed on a school roof. The solar radiation just above the atmosphere is 850 W m^-2. On a clear day, 72% of this radiation reaches the panel, and the panel converts 18% of the incident solar power on it into electrical power. What is the approximate electrical output of the panel? 一塊面積為 1.8 m^2 的光伏板安裝在學校天台。大氣層上方的太陽輻射強度為 850 W m^-2。在晴朗日子，其中 72% 的輻射到達光伏板，而光伏板可把照射在其上的太陽功率的 18% 轉換為電功率。 該光伏板的電功率輸出約為多少？ Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
An ultrasound probe sends a short pulse normally through a 1.2 cm layer of coupling gel and then into soft tissue. The speed of ultrasound in the gel is 1500 m s^-1. The first echo, from the gel-tissue boundary, is recorded at 16 us. A second echo from a boundary 4.0 cm inside the soft tissue is recorded at 68 us. What is the approximate speed of ultrasound in the soft tissue? 一個超聲波探頭發出短脈衝，垂直穿過 1.2 cm 厚的耦合凝膠層，然後進入軟組織。超聲波在凝膠中的速率為 1500 m s^-1。來自凝膠與組織邊界的第一個回聲在 16 us 被記錄。來自軟組織內 4.0 cm 深處邊界的第二個回聲在 68 us 被記錄。 超聲波在軟組織中的速率約為多少？ Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
In a thin-foil scattering experiment, fast helium nuclei are deflected mainly by atomic nuclei, while orbital electrons have little effect on their paths. Which statement best explains this? 在薄金屬箔散射實驗中，高速氦核主要受原子核偏轉，而軌道電子對其路徑影響很小。請評估以下項目，並用物理推理判斷所需結論。 Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
According to classical electromagnetic theory, what would be predicted for Rutherford's model of an atom with electrons orbiting a nucleus? 根據經典電磁理論，對於電子繞原子核運動的盧瑟福原子模型，會有甚麼預測？ Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
Which sources normally produce a continuous visible spectrum? 哪些光源通常會產生連續可見光譜？ (1) A glowing tungsten filament (2) The yellow flame of a candle (3) A low-pressure neon discharge tube (1) 發光的鎢絲 (2) 蠟燭的黃色火焰 (3) 低壓氖氣放電管 Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
For a hydrogen atom, the energy of level n is En = -E0/n^2. What is the longest wavelength of a photon that can ionize an electron initially in the second excited state? 對氫原子，能級 n 的能量為 En = -E0/n^2。若電子最初處於第二激發態，可使它電離的光子最長波長是多少？ Explain your reasoning and show any necessary working. 請清楚解釋你的答案，並列出需要的推理或計算步驟。
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Rigel is a class B supergiant, while the Sun is a class G star. The sequence of spectral c…
最多人誤揀：Rigel; the Sun / 參宿七；太陽
39% 作答者揀咗呢個錯誤選項 · 此題累計 31 次作答
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A satellite moves in a circular orbit of radius R around a planet with speed v. If another…
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31% 作答者揀咗呢個錯誤選項 · 此題累計 35 次作答
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A van travelling at speed u stops in distance d after its brakes are applied. Under the sa…
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The human eye is most sensitive near wavelength 600 nm. If the pupil diameter is 5.5 mm, e…
最多人誤揀：C. 0.08 degrees / 0.08 度
31% 作答者揀咗呢個錯誤選項 · 此題累計 35 次作答
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Figure 3 shows an ultrasound probe containing an array of small crystals. A pair of electr…
最多人誤揀：A. (1) only / (1) 只有
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