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Heat of Formation

If the temper...

Question

If the temperature of hot body is raised by $5$ % then the heat energy radiated would increase by

A

18

%

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B

24

%

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C

16

%

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D

21

%

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Solution

The correct option is D $21$ %
$E + \frac{d E}{E} = \frac{[T + \frac{5 T}{100}]^{4}}{T^{4}}$
$1 + \frac{d E}{E} = [1 + 1.05]^{4}$
$= 1.2155 - 1 = 0.2155$
$= 21.55$

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