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Q.

A black metal foil is warmed by radiation from a small sphere at temperature T and at a distance d it is found that the power received by the foil is P. If both the temperature and the distance are doubled, the power received by the foil will be

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a

8P

b

64P

c

16P

d

4P

answer is A.

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Detailed Solution

I=eσAT4d2⇒I2I1=T2T14×d1d22 here I 1=P

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