Question

Three objects coloured black, gray and white can withstand hostile conditions upto `2800^(@)C`. These objects are thrown into a furance where each of them attains a temperature of `2000^(@)C`. Which object will glow brightest?
A. White object
B. Black object
C. All glow with equal brightness
D. Grey object

Answer 1

Correct Answer - B
An ideal balck body absorbs all the radiations incident upon it and has emissivity equal to 1. if a black body and the black body will radiate the maximum power.Hence , the black object at a temperature of `2000^(@)C` will have the brightest glow.