When stimulated by electric current, mercury vapor inside a CFL produces ultraviolet light, which is re-radiated as visible light when it strikes the fluorescent compound, known as phosphor, painted on the inside of the bulb. No other element has proved as efficient in this process, so even ...
Ultraviolet (UV) radiation is a ubiquitous component of the environment that has important effects on a wide range of cell functions. Short-wavelength UVB radiation induces sunburn and is a potent immunomodulator, yet longer-wavelength, lower-energy UVA
Ultraviolet (UV) radiation is a ubiquitous component of the environment that has important effects on a wide range of cell functions. Short-wavelength UVB radiation induces sunburn and is a potent immunomodulator, yet longer-wavelength, lower-energy UVA radiation also has effects on mammalian immunity...
Ultraviolet (UV) light is one form of electromagnetic energy produced naturally by the sun. UV is a spec- trum of light just below the visible light and it is split into four distinct spectral areas-Vacuum UV (100 to 200 nm), UVC (200 to 280 nm), UVB (280 to 315 nm) and UVA (...
ultraviolet light excites fluorescence within molecules in the specimen. The objective lens collects the fluorescent-wavelength light produced. This fluorescent light passes through the dichroic mirror and a barrier filter (that eliminates wavelengths other than fluorescent), making it to the eyepiece to ...
There are several more noble gases to consider, however. Marty is now examining xenon, which is a key tracer for learning how much ultraviolet light was produced by the Sun. Xenon in the atmosphere is "under-abundant by a factor of 20" when compared to other noble gasses, Marty said. "...
(The end of Dark Ages occurred at a time scientists formally call the era of "reionization." That's because this ultraviolet light, produced by giant stars inside galaxies, changed or "ionized" the thick fog of primordial atoms in the universe.)...
And to make it more confusing, older studies on the effects of blue and violet light aren’t as valid. A lot of the time the lights used in the studies also produced UV, so it’s possible that the effects they found were from the contaminating UV rays and not the visible light at ...
4. True or false: Every snowflake is unique. True. Every snowflake really is different from one another. Learn More: Is Every Snowflake Actually Unique? 5. In order to truly be Champagne, where must it be produced? Barcelona, Spain Champagne, France Napa, California Rome, Italy According...
Visible light photons and X-ray photons are both produced by the movement of electrons in atoms. Electrons occupy different energy levels, or orbitals, around an atom's nucleus. When an electron drops to a lower orbital, it needs to release some energy -- it releases the extra energy in ...