Heat TransferEasy
Question
An ideal black-body at room temperature is thrown into a furnace. It is observed that
Options
A.initially it is the darkest body and later times the brightness
B.it is the darkest body at all times
C.it cannot be distingushed at all times
D.initially it is the darkest body and later times it cannot be distingushed.
Solution
Black body radius maximum number wavelength and maximum energy if all other conditions (eg, temperature surface area etc) are same. So when the temperature of black body becomes equal to the temperature of the furnace, the black body will radiate maximum energy and it will be brightness of all. Initially, it will absorb all the radiant energy incident on it, so it is the darkest one.
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