Question

The temperature of a piece of iron is and it is radiating energy at the rate of. If its temperature is raised to , the rate of radiation of energy will become approximately

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

Answer 2

$E _ { 2 } = E _ { 1 } \frac { T _ { 2 } ^ { 4 } } { T _ { 1 } ^ { 4 } } = Q \times \frac { ( 273 + 151 ) ^ { 4 } } { ( 273 + 27 ) ^ { 4 } } = \left( \frac { 424 } { 300 } \right) ^ { 4 } = 3.99 Q \approx 4 Q$