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teggenspiller
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Homework Statement
a sphere of radius 1/2meter, temperature 27*C, and emmisisvity 0.85 is located in an environment of 77*C. What is net flow of energy transferred in 1 second.
Homework Equations
So in my notes i have notes that say "heat transfer by radiation":
P= stefans constant * Area sphere * emisivity * T^4
stef's constant= 5.67*10^-8 W/m^2 K^4
A= area
T= absolute kelvin temp
e= emmisivity
and Area of Sphere= 4*pi*r^2
and "Heat by absorbtion"
when i suppose by Conservation energy these values would be equal..
however the equation is the same except for the T values show
T^4- Te^4
Te= temp of the environment
The Attempt at a Solution
As i have been writing this i realized where I went wrong. I used Celcius temps instead of KELVIN temps! however, can anyone explain to me/give me an example that i can think of, why the Temperatures are to the FOURTh power? that certainly seems like a alot...?