Light is emitted as the electrons move from higher to lower electronic orbitals. How do the electrons obtain energy to move to the higher orbital initially? Would you classify the light producing reaction as having a positive or negative free energy?
The electromagnetic spectrum describes different types of electromagnetic radiation in terms of their frequencies and associated wavelengths. Certain wavelengths from this spectrum can be absorbed by atoms or molecules to excite them, or these wavelengths can be emit...
Light is a form of energy, which can be emitted through a variety of processes. These processes include: Incandescence: The emission of light due to heat (as in an ordinary light bulb or a gas lantern) Fluorescence and phosphorescence: The emission of light in response to radiation energy (...
An OLED is simply an LED where the light is produced ("emitted") by organic molecules. When people talk about organic things these days, they're usually referring to food and clothing produced in an environmentally friendly way without the use of pesticides. But when it comes to the chemistr...
Light is reflected from white areas of the paper and strikes the drum below. Wherever a photon of light hits, electrons are emitted from the photoconductive atoms in the drum and neutralize the positive charges above. Dark areas on the original (such as pictures or text) do not reflect ...
Since LEDs are solid-state components, they create “cold” light instead of the “warm” light of incandescent bulbs. Most of the energy generated from an incandescent light is not light, but heat. In an LED, however, almost all energy is emitted as light waves. That is one reason that...
the change in frequency of light or sound emitted by a moving object that in the astronomical world manifests as the so-calledredshift, the shift towards "redder", longer wavelengths in objects speeding away from us. In a leap of intuition, Rømer determined that light was taking measurable...
How the Universe Works《了解宇宙是如何运行的(2010)》第九季第十集完整中英文对照剧本.docx,观察宇宙首先用到的是光,可见光 First there was light, visible light. 然后我们用无线电和X射线观察宇宙 Then, we viewed the universe in radio waves and X-rays. 自从天
When he did this, he was able to detect electrons being emitted from the surface. This was Einstein's explanation: If the energy in light comes in bundles, then one can think of light as containing tiny lumps, or photons. When these photons strike a metal surface, they act like billiard...
Light is reflected from white areas of the paper and strikes the drum below. Wherever a photon of light hits, electrons are emitted from the photoconductive atoms in the drum and neutralize the positive charges above. Dark areas on the original (such as pictures or text) do not reflect ...