Use Stefan's law to find the intensity of the cosmic background radiation emitted by the fireball of the Big Bang at a temperature of 2.81 K.

Complete Question

Use Stefan's law to find the intensity of the cosmic background radiation emitted by the fireball of the Big Bang at a temperature of 2.81 K. Remember that Stefan's Law gives the Power (Watts) and Intensity is Power per unit Area (W/m2).

The intensity is

Explanation:

From the question we are told that

    The temperature is  

Now  According to Stefan's law

Where   is the Stefan Boltzmann constant with value  

  Now the intensity of the cosmic background radiation emitted according to the unit from the question is mathematically evaluated as

=>      

=>      

substituting values

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