A: stimulated absorption
B: spontaneous radiation
C: stimulated radiation
D: spontaneous radiation
举一反三
- The light emitted by the LED is incoherent light, and its basic principle is . A: spontaneous radiation B: stimulated absorption C: stimulated radiation D: spontaneous absorption
- The<br/>three basic processes involved in generating laser include:() A: spontaneous<br/>radiation B: stimulated<br/>emission C: stimulated<br/>absorption D: laser<br/>amplification
- Which<br/>kind of physical hazard causes the welding flash? () A: Light B: Ionizing radiation C: Ultraviolet radiation D: Vibration
- The accumulation of greenhouse gases (GHGs) causes global warming by letting sunlight into the atmosphere as _______. Then, when the earth re-radiates the heat back to space, the gases trap the energy in the form of outgoing ______. A: visible light, ultraviolet radiation B: infrared radiation, ultraviolet radiation C: ultraviolet radiation, infrared radiation D: infrared radiation, radio waves
- The eyes may be injured by A: Mechanical impact B: UV light C: Radiation D: Chemical
内容
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Which is NOT the correct description about Laser? A: It stands for Light Amplification by Stimulated Emission. B: It’s a beam of light energy. C: All the light waves in a laser are emitted in the same rhythm. D: The light waves in a laser are of different wavelengths.
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What is the process principle of welding A: laser radiation onto material B: melting of material C: resolidfying of material D: absorption of material
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LIGHT: COLOR :: A: radiation: temperature B: celerity: span C: quality: quantity D: sound: pitch E: strength: stress
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产生激光（光的受激辐射放大）的四个过程中，最重要的是 A: Pumping B: Spontaneous emission C: Stimulated emission D: Absorption
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What kind of wave does ultrasound belong to and has certain radiation? A: Electromagnetic wave B: Mechanical wave C: Particle wave D: Light wave