The light emitted by the LED is incoherent light, and its basic principle is .
A: stimulated absorption
B: spontaneous radiation
C: stimulated radiation
D: spontaneous radiation
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