Question

List two artificial sources of light.

Answer 1

Hint :Sources of light are categorized on the basis of whether their light emitting property is natural or artificial. Natural luminescence means that the body is emitting light on its own without any influence and available in nature. Artificial corresponds to those sources which are man made and may or may not emit light under an influence. So, in this question we are asked to name those sources which are man-made and may or may not operate under an influence.

Complete Step By Step Answer:
Light is a form of energy that enables us to see. There are many sources of light each of them characterized by some inherent property that enables them to act as a source of light.
Depending upon that property the sources are classified as
-Natural
-Artificial

-Natural sources are those sources which naturally emit light as a part of their own chemical cycles.
For example, sun, stars, etc.

-Artificial sources are those sources which are man- made and emit light when stimulated to.
For example, bulbs, tube lights, etc.

Note :
The most important difference between natural light and artificial light is that natural light can be found in nature but artificial light is electronic which is formed with the help of advanced technology. Natural light has no control over the usage because it is predicated on the duration of the time in consideration but this is not the case with artificial light. Usage of artificial light is limited. The amount of light produced is the major factor of using artificial light. If the artificial light is produced in less quantity, then the consumption is also low.