Question

An ideal black body at room temperature is thrown in a furnace. It is observed that

• A. initially it is darkest body and at later time the brightest
• B. it is darkest body at all the times
• C. it cannot be distinguished at all the times
• D. initially it is the darkest body and at later times it cannot be distinguished

Answer 1

The correct option is D initially it is the darkest body and at later times it cannot be distinguished

Initially the black body is in bright environment. So, it appears dark and finally when its temperature becomes equal to temperature of furnace, it becomes invisible