X-rays are made up of ___. A: electrons B: protons C: photons D: Neutrons
X-rays are made up of ___. A: electrons B: protons C: photons D: Neutrons
The momentum of photons corresponding to the minimum wavelength emitted from x-ray tube whose operating voltage is 120 kV is ( )
The momentum of photons corresponding to the minimum wavelength emitted from x-ray tube whose operating voltage is 120 kV is ( )
Which of the following mechanisms can be used in order to split a high energy photon in two (or more) lower energy photons? A: Multi-junction B: Up-conversion C: Down-conversion D: Intermediate band
Which of the following mechanisms can be used in order to split a high energy photon in two (or more) lower energy photons? A: Multi-junction B: Up-conversion C: Down-conversion D: Intermediate band
生物发光数据定量时应该使用哪种类型？ A: NTF Efficiency NTF效率 B: Radiance(photons)光子数 C: Radiant Efficiency发光效率 D: Efficiency (epifluorescence) 效率（表面荧光）
生物发光数据定量时应该使用哪种类型？ A: NTF Efficiency NTF效率 B: Radiance(photons)光子数 C: Radiant Efficiency发光效率 D: Efficiency (epifluorescence) 效率（表面荧光）
Which of the following statements belong to Einstein's achievements in physics? A: It was proved that atoms and molecules existed. B: Light came in little bits (or photons) C: Space and time, like threads in a common fabric,could be bent, stretched and twisted. D: E=mc²
Which of the following statements belong to Einstein's achievements in physics? A: It was proved that atoms and molecules existed. B: Light came in little bits (or photons) C: Space and time, like threads in a common fabric,could be bent, stretched and twisted. D: E=mc²