Question

Which of the following is a real life example of a perfect blackbody?

• A. Red hot metal
• B. White hot metal
• C. Orange hot metal
• D. Yellow hot metal

Answer 1

The correct option is B White hot metal

Blackbody is an ideal body which can absorb all incident electromagnetic radiation as well as emit radiation called black-body radiation.

When a metal is heated, then its color changes from red $\to$ orange $\to$ yellow $\to$ white , as the temperature increases. Hottest metal has white color. Hotter bodies can radiate all frequencies as well as absorb.
Hot bodies like the sun and white hot metal are best examples of a blackbody as they emit huge energy.