Question

What is the effect of heat producing light is known as?

• A. Incandescence
• B. Light effect
• C. Heat effect
• D. Energy effect

Answer 1

The correct option is A

Incandescence

Incandescence is the emission of light by a solid that has been heated until it glows, or radiates light. When an iron bar is heated to a very high temperature, it initially glows red, and then as its temperature rises it glows white. Incandescence is heat made visible - the process of turning heat energy into light energy.

In the old filament bulbs, the tungsten wire when subjected to electricity becomes very hot and starts glowing and fills a room with light. This is why these old bulbs are also known as incandescent bulbs.