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).
Answer:
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