The minimum temperature of a body at which it emits light is

Physics Ray Optics Prism Theory & Dispersion of Light Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: September 12, 2026

1200°C

1000°C

500°C

200°C

Text Solution

Verified by Experts

The correct answer is:

The minimum temperature at which a body emits visible light is known as the 'incandescence' temperature. Commonly, this temperature is around 1200°C.

At temperatures below this, objects emit mainly infrared radiation.
As the temperature increases, the emission spectrum shifts towards visible light.
For instance, iron glows red at approximately 800°C, but it requires about 1200°C to emit a significant amount of light in the visible spectrum.

Therefore, the correct answer is A: 1200°C.

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