Question

Why is a conical projection in front of the hole i.n Fen-y's blackbody?

विकल्प

• To avoid absorption of radiations

• To avoid return of the radiations by reflection.

• To avoid emission of radiations

• For some reason other than those mentioned above

Answer 1

To avoid return of the radiations by reflection.

Explanation:

The blackbody is the darkest at room temperature, and when placed in a furnace, it absorbs heat until it reaches the temperature of the furnace. After that, it emits all wavelengths of energy and appears bright.