Question

Use stefan’s law to calculate the total power radiated per square meter by a filament at 1727^0 C having an absorption factor of 0.4.

Answer 1

Answer on Question #74069, Physics / Quantum Mechanics

Question Use stefans law to calculate the total power radiated per square meter by a filament at 1727 C having an absorption factor of 0.4.

Solution The stefans law gives power per square meter:

$j=\varepsilon\sigma T^{4}$

where $\sigma=5.67\times 10^{-8}$ W m^{-2}K^{-4}. So we can find the power:

$j=0.4\cdot 5.67\cdot 10^{-8}\cdot 1727^{4}\approx 201749.47\,W,\approx 202\cdot 10^{3}\,W$