Question

Write down five man-made sources of light?

Answer 1

Hint: If we look at a leaf we recognize that it is green because light bounces from the leaf to our eyes to say that it is green. But light is electromagnetic radiation. A precise frequency of this radiation (about 390-700 nm) is observable to the human eye. All that we see around us is because of light. Light is a form of energy and same as all energies, it is also created from a source. These are named light sources. Here we need to mention a few artificial sources of light.

Complete step by step solution:
The types of light sources are as follows:
Natural sources
Artificial sources
Here we only explain the artificial sources of light: Light can be created artificially too. The diverse light sources created artificially can be put under three wide categories- They are
Incandescent Sources: When certain substances are heated to a very high temperature, they start to emit light. Both infrared and visible light is created in the procedure. Examples are candles, incandescent lamps.
Luminescent Sources: Light can be created by accelerating charges inside a luminescent material. One regular way of doing it is by moving current through the material. Examples are Fluorescent tube light, electric bulb
Gas Discharge Sources: When we pass electricity through certain gases at very low pressure, it can yield light too. Examples are Neon lamps, Sodium lamps.

Note:
The Sun is the main source of light for the earth. The sun is a huge fireball, and its centronuclear fusion creates massive energy. This energy arises as heat and light. Sunlight is one of the main factors for the sustainability of life on earth. Many stars produce light too, but only a small part of it or nothing reaches the earth because of its large distances.