Question

The rate of radiation of a black body at 0°C is EJ/sec. The rate of radiation of this black body at $273 ^ { \circ } \mathrm { C }$ will be

• A. $16 E$
• B. $8 E$
• C. $4 E$
• D. $E$

Answer 1

Answer: (A)

$16 E$

Answer 2

$\frac { E _ { 1 } } { E _ { 2 } } = \left( \frac { T _ { 1 } } { T _ { 2 } } \right) ^ { 4 } \Rightarrow \frac { E } { E _ { 2 } } = \left( \frac { 273 + 0 } { 273 + 273 } \right) ^ { 4 }$ $\Rightarrow E _ { 2 } = 16 E$ .