JEE Main & Advanced Sample Paper JEE Main Sample Paper-25

  • question_answer
    Three objects coloured black, grey and white can with stand hostile conditions at \[{{2800}^{o}}C\]. These objects are thrown into furnace where each of them attains a temperature of \[{{2000}^{o}}C\]. Which object will glow brightest?

    A)  the white object

    B)  the black object

    C)  all glow with equal brightness

    D)  grey object

    Correct Answer: B

    Solution :

    An ideal black body absorbs all the radiations incident upon it and has an emmissivity equal to 1. If a blackbody and an identical another body are kept at the same temperature, then the black body will radiate maximum power. Hence, the black object at a temperature of \[2000{}^\circ C\] will glow brightest.


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