A black body is at $727^{\circ} \mathrm{C}$. It emits energy at a rate which is proportional to:

• A

  $(1000)^4$
• Correct answer
  B

  $(1000)^2$
• C

  $(727)^4$
• D

  $(727)^2$

Solution

According to Stefan's law Rate of radiated energy $E \propto T^4$ where $T=$ absolute temperature of a black body
$\therefore E \propto(727+273)^4 \text { or } E \propto[1000]^4$

Hence, the correct answer is option: 'B'.