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.Continue Reading
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
A type "C" light bulb is a cone-shaped light bulb that is designed for small appliances and indicator lamps. The "C" refers to the cone shape of the bulb. There are many different kinds of "C" light bulbs. However, they generally fall into two categories: decorative and regular.Full Answer >
Sources of light are things or devices that produce light, and the two general sources are natural and artificial. The sun is Earth’s main source of natural light that releases its energy as heat and light. This light is known as white light, and it is what gives Earth daylight. Other forms of natural light include other stars, the moon, lightning, aurorae and noctilucent clouds.Full Answer >
An incandescent light bulb uses electricity to heat up a tungsten wire encased in a glass shell until it glows. Because this light source also gives off heat, it is often used in incubators and lava lamps and to speed the drying process.Full Answer >
An incandescent light bulb is made out of glass and metal. It is filled with an inert gas such as argon. This gas helps to slow down the deterioration of the metal filament.Full Answer >