Photoelectric Effect
★Exhibit Content: Principle of the photoelectric effect, concepts of quantum physics ★Interaction: Electromechanical interactive demonstration ★Operation: 1. Turn on the ultraviolet light device and observe the tip discharge phenomenon on the zinc plate surface; 2. Intuitively understand the process in which electrons inside the zinc plate are excited and escape under ultraviolet irradiation to form a photocurrent; 3. Combined with the information board, learn about the scientific significance of Einstein's photoelectric effect theory. ★Exhibit Description: The exhibit consists of an ultraviolet light device, a zinc plate, a tip discharge device, and a transparent protective cover. When visitors turn on the ultraviolet light device, ultraviolet light irradiates the surface of the zinc plate; electrons inside the zinc plate absorb photon energy, are excited, and escape, forming a photocurrent. Through the tip discharge device, this microscopic process is converted into a visible discharge phenomenon. This exhibit transforms Einstein's Nobel Prize-winning photoelectric effect theory into an intuitive and operable experimental demonstration, helping the public understand the particle nature of light and the concept of energy quantization. ★Scientific Principle: The core educational content of the exhibit revolves around Einstein's photoelectric effect equation, combined with the scientific basis of quantum physics: 1. Photon excitation of electrons: When ultraviolet light irradiates the zinc plate, the photon energy hν is greater than the work function W0 of the zinc plate. Free electrons inside the zinc plate absorb the photon energy, are excited, and escape from the surface, forming photoelectrons. 2. Formation of photocurrent: The escaped photoelectrons move directionally under the action of the electric field, forming a photocurrent. 3. Tip discharge phenomenon: When the photocurrent passes through the tip discharge device, due to the large curvature of the tip and the high electric field strength, the air is ionized, producing a visible tip discharge (spark or arc), intuitively proving the existence of the current.
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- Φ1.0×1.2m Φ1.0×1.2mDimensions (unit: m): Φ1.0×1.2m Brand: KexMall Model: PopsciCat-ElectroMagnetic-165 1. Materials ① Cabinet components: Q235-1.5mm sheet metal with baked paint, 12mm Kelesi artificial stone countertop ② Protective structure: Acrylic protective cover (transparent, shatterproof, protects internal components) ③ Information board, graphic panel: Transparent acrylic UV printing ④ Electrical control box: Cold-rolled sheet metal with baked paint (including leakage switch, switching power supply, controller, etc.) 2. Main Configuration ① Core experimental device: Ultraviolet light power generation demonstration component (1 set) ② Protection system: Acrylic protective cover (1 piece) ③ Electrical control system: Electrical logic control system (1 set, including leakage switch, switching power supply, controller) ④ Drive device: Ultraviolet light source drive module, tip discharge trigger component ⑤ Electrical control system: Electrical logic control system, equipped with Guanjian® K1 PLC controller with protection specially for science exhibits 3. Layout Requirements ① Power requirement: AC100-240V, 50/60Hz/50～60Hz 200W (standard three-wire socket, reliably grounded) ② Installation method: Direct placement ③ Entry passage: Door frame dimensions (width×height) ≥1.4m×1.4m, continuous turning interval ≥2m ④ Maintenance access: Not required
★Exhibit Content: Principle of the photoelectric effect, concepts of quantum physics ★Interaction: Electromechanical interactive demonstration ★Operation: 1. Turn on the ultraviolet light device and observe the tip discharge phenomenon on the zinc plate surface; 2. Intuitively understand the process in which electrons inside the zinc plate are excited and escape under ultraviolet irradiation to form a photocurrent; 3. Combined with the information board, learn about the scientific significance of Einstein's photoelectric effect theory. ★Exhibit Description: The exhibit consists of an ultraviolet light device, a zinc plate, a tip discharge device, and a transparent protective cover. When visitors turn on the ultraviolet light device, ultraviolet light irradiates the surface of the zinc plate; electrons inside the zinc plate absorb photon energy, are excited, and escape, forming a photocurrent. Through the tip discharge device, this microscopic process is converted into a visible discharge phenomenon. This exhibit transforms Einstein's Nobel Prize-winning photoelectric effect theory into an intuitive and operable experimental demonstration, helping the public understand the particle nature of light and the concept of energy quantization. ★Scientific Principle: The core educational content of the exhibit revolves around Einstein's photoelectric effect equation, combined with the scientific basis of quantum physics: 1. Photon excitation of electrons: When ultraviolet light irradiates the zinc plate, the photon energy hν is greater than the work function W0 of the zinc plate. Free electrons inside the zinc plate absorb the photon energy, are excited, and escape from the surface, forming photoelectrons. 2. Formation of photocurrent: The escaped photoelectrons move directionally under the action of the electric field, forming a photocurrent. 3. Tip discharge phenomenon: When the photocurrent passes through the tip discharge device, due to the large curvature of the tip and the high electric field strength, the air is ionized, producing a visible tip discharge (spark or arc), intuitively proving the existence of the current.
- 1.2×0.8×1.1m 1.2×0.8×1.1mDimensions (L×W×H): 1.2×0.8×1.1m Brand: KexMall Model: PopsciCat-ElectroMagnetic-166 1. Materials: ① Base: Frame 2mm cold-rolled sheet, enclosure 2.0mm cold-rolled sheet, surface electrostatic baked paint ② Countertop: Kelesi artificial stone, thickness ≥12mm ③ Protective cover: Transparent high-transparency acrylic, edge polished, bottom yellow acrylic edging ④ Lifting bracket: Aluminum alloy profile ⑤ Information board: 5mm thick acrylic UV inkjet printing ⑥ Maintenance door: 2.0mm cold-rolled sheet with baked paint surface ⑦ Electrical control box: Integrated air switch, relay, power module, control circuit board, DC24V power supply 2. Main Configuration: ① Adjustable light source module: Adjustable spectrum light source, with matching drive power supply ② Photoelectric receiving plate: Beijing Dingzhi metal photocathode component ③ Electric lifting mechanism: HF-PANDA linear electric push rod, for light source distance adjustment ④ Pointer galvanometer: Microcurrent detection pointer dial ⑤ Control buttons: Self-resetting 22mm stainless steel metal buttons, 3 in total for start, up, and down ⑥ Electrical control system: Electrical logic control system, equipped with Guanjian® K1 PLC controller with protection specially for science exhibits, with timing control circuit board 3. Layout Requirements: ① Power requirement: AC100-240V, 50/60Hz 300W (standard three-wire socket) ② Installation base: Console placed directly on the floor ③ Entry passage: Door frame dimensions (width×height) ≥1.5m×1.2m, continuous turning interval ≥2.5m ④ Maintenance access: Not required
★Exhibit Content: Photoelectric effect physical phenomenon, light quantum principle ★Interaction: Electromechanical interaction ★Operation: 1. Press the start button to turn on the light source; 2. Press the up and down buttons to adjust the distance between the light source and the photoelectric plate, and observe the change in the galvanometer pointer. ★Exhibit Description: This exhibit is a recommended exhibit from the KexMall exhibit mall. It consists of an integrated purple and white console, a high-transparency acrylic protective cover, a light source module, a photoelectric receiving plate, an adjustable lifting mechanism, and a pointer galvanometer. The transparent protective cover protects the internal experimental components and prevents visitors from directly touching the experimental device. By adjusting the distance between the light source and the photoelectric plate, visitors observe the deflection of the galvanometer pointer, intuitively experiencing the effect of changes in lighting conditions on the generation of photocurrent, concretely understanding the photoelectric effect phenomenon, and learning about its practical applications in photoelectric sensors, light-controlled devices, and other fields. ★Scientific Principle: When light of a specific frequency irradiates a metal surface, electrons inside the metal absorb photon energy, break free from the metal's binding, and escape from the surface, forming photoelectrons, which create a photocurrent in the external circuit. This is the photoelectric effect. The light intensity and the distance between the light source and the photoelectric plate affect the number of escaped photoelectrons, thereby changing the magnitude of the photocurrent, and the galvanometer pointer deflects accordingly to different degrees. The photoelectric effect proves that light has particle nature and is an important fundamental theory of quantum physics, widely used in photoelectric detection, photoelectric switches, and other equipment.
Review
Principle Display: ★★★ Interaction Effect: ★★★ Ease of Installation: ★★★★★ Durability: ★★★★ Overall Rating: ★★★★