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 >
Most commonly, light bulbs explode when manufacturers do not put enough insulation on the base of the bulb, which causes the base to melt and allows the gas stored in the light bulb to leak out. The leaking gas causes a pressure difference which results in the light bulb exploding.Full Answer >
There are many different types of objects, liquids and substances that glow when exposed to black light. Generally, these liquids have molecules with rigid structures and delocalized electrons because these properties usually lend themselves to the reaction of glowing under a black light. Some examples of liquids that glow under a black light are petroleum jelly, tonic water, water with vitamins in it, antifreeze and even some bodily fluids.Full Answer >
Compact fluorescent light bulbs (or CFLs) are identified by the white glass tube spiralling up from the base of the bulb that houses a tiny electronic ballast. This design has since been modified by placing a secondary glass housing around the spiral fluorescent tube to make it more appealing.Full Answer >