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

radiation

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

the of nuclear radiation

 radiation sterlization

reflecting<br/>radiation ______ 。

名词解释：thermal radiation

The method in which the greenhouse effect takes place is by A: gamma radiation from the earth is absorbed into the atmosphere by particulates B: beta radiation from the Sun is absorbed by water vapor C: ultraviolet radiation from the Sun is absorbed by ozone D: infrared radiation from the Earth's surface is absorbed by multiple gases in the atmosphere E: cosmic radiation from deep space is absorbed by gases in the atmosphere

Q5. The main idea of the text is _____. A: younger people are more susceptible to even small amounts of radiation B: no scientific evidence has been found about the effect of cosmic radiation C: radiation has the greatest effect on fast dividing and developing cells D: radiation may be a greater cancer risk for adults than doctors thought

Which<br/>kind of physical hazard causes the welding flash? () A: Light B: Ionizing radiation C: Ultraviolet radiation D: Vibration