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Assuming that the emissivity e = 0.8, what is the rate at which iron radiates energy after it has lost 8.0 × 106J?

I know the answer is 220 W, but how do I get that answer? Thanks!

- Thread starter physics123
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- #1

- 21

- 2

Assuming that the emissivity e = 0.8, what is the rate at which iron radiates energy after it has lost 8.0 × 106J?

I know the answer is 220 W, but how do I get that answer? Thanks!

- #2

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A thorough analysis would consider the uneven temperature distribution that would develop within the bar as it cools. It involves Fourier transforms. I shall guess you are not expected to allow for that.

Assuming that the emissivity e = 0.8, what is the rate at which iron radiates energy after it has lost 8.0 × 106J?

I know the answer is 220 W, but how do I get that answer? Thanks!

What would be the temperature drop in losing that much energy?

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