Radiation Rate of 0.1m Cube Metal at 200C

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Homework Help Overview

The discussion revolves around calculating the radiation rate of a 0.1m cube of metal with a specified emissivity at a given temperature. The subject area includes concepts of thermal radiation and the Stefan-Boltzmann law.

Discussion Character

  • Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the Stefan-Boltzmann equation but questions their result after calculating a radiation rate that differs from the expected answer. Participants also engage in clarifying the geometry of the cube.

Discussion Status

The discussion is ongoing, with participants providing clarifications and checking assumptions about the cube's geometry and the calculations involved. There is no explicit consensus on the correct approach yet.

Contextual Notes

Participants are addressing potential errors in unit conversion and calculation steps, as well as confirming basic properties of the cube relevant to the problem.

Kyle North
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Homework Statement


At what rate does a 0.1m cube of metal with emissivity e=0.75 radiate energy if it is at a temperature of 200C?

Homework Equations



H=AeσT^4, σ=5.67 x10^-8

The Attempt at a Solution


I found the area of the cute to be A=(0.1m)^2=0.01m, and the turned 200C into 473K, but when I type them all in I get 21.28W and the answer is 128W?
 
Physics news on Phys.org
How many faces does a cube have?
 
6.. thanks!
 
Also, (0.1 m)2 = 0.01 m2 Don't forget to square the units.
 

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