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Q.

The emissivity of a perfect black body is increased to 16 times by increasing its temperature. If the initial temperature is T, then final temperature of that black body is

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a

8 T

b

2 T

c

4 T

d

16 T

answer is C.

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Detailed Solution

Q∝T14 and 16Q∝T24 or  16=T24/T14  or  24=T2/T14∴ T2=2T

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The emissivity of a perfect black body is increased to 16 times by increasing its temperature. If the initial temperature is T, then final temperature of that black body is