Question

If the temperature of an iron rod is doubled then the amount of radiation emitted by it, as compared to its initial value, becomes

• A. 1/2 times
• B. equal
• C. 4 times
• D. 16 times

Answer 1

Answer: (D)

16 times

According to Stefan's law, the ratio of energy emission is directly proportional to fourth power of temperature, by increasing temperature to two times , the energy emitted will be 16th times of previous value. Thus the correct answer is D.