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 >
To shorten the chain on a chandelier, use wire cutters to reduce the length of the electric wiring, and remove links from the chain to get the chandelier to the desired height. Account for tables or other objects that you plan to place beneath the chandelier.Full Answer >
There are many ways to decorate with white string lights, from decorating a Christmas tree to wrapping them around a staircase to light the path to a bedroom or porch. They can be used to outline an indoor mirror, and they also look attractive when draped over a shelving unit.Full Answer >
To rewire a lamp, remove the lamp, cover and socket, then remove the old cords and fix the new ones. Use a folded towel, a screw driver, electrical tape, wire cutters, strippers and a new lamp cord to accomplish this task.Full Answer >