In fluorescence, an object absorbs and releases lower energy light almost simultaneously, but in phosphorescence, the release of light is delayed. Both fluorescence and phosphorescence are types of photoluminescence.Know More
The difference in the time before light is emitted in fluorescence and phosphorescence can be explained by looking at the electronic processes involved. What happens in fluorescence is that when an orbital electron of an atom goes back to its ground state after being excited to a higher quantum state, it emits a photon of light. This occurs in a matter of milliseconds. In phosphorescence, the excitation to a higher state involves a change in the electron spin state. Because of this, the electrons cannot easily relax back to the ground state. This process can take minutes or hours.
A classic example of phosphorescent materials are objects that glow in the dark. When placed in a bright room, these items charge up for a while and then glow when moved to a dark location, and then the glowing objects would cease emitting light after some time. An example of fluorescence can be seen when using a black light. Certain objects glow immediately, but only when the black light is shining on them.Learn more about Lighting
Stars, including the sun, derive their energy from the process of nuclear fusion taking place in their cores which causes a release of light at the surface. This process converts matter into energy and releases vast quantities of neutrinos and gamma rays. The sun has a core of about 27 million degree Fahrenheit.Full Answer >
The Hampton Bay lighting company can be reached by calling 855-HD-Hampton. The company's customer service is available Monday through Friday 8 a.m. to 7 p.m. and Saturday 9 a.m. to 6 p.m., as of January, 2015. The company can also be contacted by email through the Home Depot website.Full Answer >
To install under-cabinet lighting, install the included screws under the cabinets, and mount the units on the screws. You need an under-cabinet lighting kit, a power drill with a 1/16-inch drill bit, a screwdriver and electrical cable staples.Full Answer >
To tell a real Tiffany lamp apart from its many forgeries, you need to carefully examine both the glass shade and bronze base. An authentic Tiffany lamp is one made between 1890 and 1930 by Tiffany Studios and can be worth anywhere between $4000 to over $1 million, as of 2015.Full Answer >