What are some light sources?

Answer 1

(Includes answer to the question "Name ten sources of (visible) light")

All light originates in the emission of photons from electronic or nuclear processes, however those processes come in a variety of flavors, such as:

1. Thermal emission, consisting of "black body" radiation from hot objects such as incandescent light bulb filaments, and many other examples.

2. Molecular emission, such as that from hot gases in the flame of an oxyacetylene torch.

3. Phosphorescence, the delayed emission of light from a material after it has been stimulated, such as from the screen of a CRT tube after it is bombarded by electrons.

4. Fluorescence, the direct emission of light by some substances when they are stimulated by electrons or electric currents, such as an ordinary fluorescent light bulb.

5. Bioluminescence, such as the light emitted by Fireflies by means of chemical processes. Other examples include certain worms and fish.

6. Chemiluminescence, light emitted in chemical reactions other than in living things.

7. Sonoluminescence, light emission by the collapse of tiny bubbles in a fluid stimulated by sound waves.

8. Cerenkov or Cerenkov radiation, which is emitted when particles move faster than the speed of light through a medium (not faster than the speed of light in a vacuum).

9. Spontaneous emission, such as in a Light Emitting Diode (solid state) or Neon Bulb (Gaseous state) when stimulated by an electric current.

10. Stimulated emission, such as a laser.

11. Scintillation, a variation of fluorescence in which, for example, some substances emit light when struck by a subatomic particle.

12. Cyclotron radiation, which occurs when electrons are decelerated, whether in a straight line or by curving, as in a Cyclotron.

(Partially adapted from the entry on "Light" on Wikipedia.)

Answer 2

Some light sources are: fire, sun, stars, Milky Way, meteors, Supernova, lightning, Auroras, lava- they were natural light sources. Man-made: torch, light bulbs, light house, spotlight, TV, car lights (head, side), oil lamps. this is all i can think of today.

Answer 3

Another light source would be the sun and electricity,light is a form of energy!

Answer 4

The sun, fire, lightning, bio-luminescant animals (like fireflies)

Answer 5

Led Roadway Light