Three objects colored black, gray and white can with stand hostile conditions upto 2800oC. These objects are thrown into furnace where each of them attains a temperature of 2000oC, Which object will glow brightest
A
the white object
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B
the black object
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C
all glow with equal brightness
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D
gray object
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Solution
The correct option is A the black object Black has greatest emissivity and greatest absorptivity as compared with other colours. At 2000oC it will have greatest emissivity so it will glow brightest.