If a burning log is a black object with a surface area of 0.25 m2 and a temperature of 800 8c, how much power does it emit as thermal radiation?

The correct answer of this question: 18789.79 watt.

EXPLANATION:

As per the question, the surface area of the log is given as A =

The temperature of the of the surface of the log t = 800

We know that

                      ⇒ 800 degree celsius= 800+273 K

                                                           = 1073 K.

Here, K stands for kelvin scale.

We are asked to calculate the thermal power radiation .

The power is defined as the amount of energy released per unit time.

Hence, power is calculated as-

                                Power P =

                                               =

                                               = 18789.79 watt.      [ans]

Here, is the Stefan-Boltzmann constant and T is the absolute temperature of the log.

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