An ideal Black-body at room temperature is thrown into a furnace. It is observed that [2002]

Question

An ideal Black-body at room temperature is thrown into a furnace. It is observed that [2002]

Smart Achievers · Accepted Answer

(1)

According to Kirchhoff's law, good absorbers are good emitters and bad reflectors.

At high temperature (in the furnace), since it absorbs more energy, it emits more radiations as well and hence is the brightest and it is the darkest body initially.

Solution

Q.
An ideal Black-body at room temperature is thrown into a furnace. It is observed that [2002]

1 initially it is the darkest body and at later times the brightest

2 it is the darkest body at all times

3 it cannot be distinguished at all times

4 initially it is the darkest body and at later times it cannot be distinguished

Ans.
(1)

According to Kirchhoff's law, good absorbers are good emitters and bad reflectors.

At high temperature (in the furnace), since it absorbs more energy, it emits more radiations as well and hence is the brightest and it is the darkest body initially.

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