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This question is an exact duplicate of:

The question reads:

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The solution reads:

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My only answer is for 4 and it is $\pi I_\nu$. Where did I go wrong?

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marked as duplicate by dmckee Oct 9 at 20:31

This question was marked as an exact duplicate of an existing question.

  • $\begingroup$ Please do not repeatedly post the same question. You can edit the original to clarify it, but you should also not repeatedly edit in an effort to stay on the top of the active queue. $\endgroup$ – dmckee Oct 9 at 20:32
  • $\begingroup$ This isn't a duplicate, if you read the contents of my post you'd see it's an expansion. Maybe prevent users from posting one line replies in place of constructive feedback we can learn? $\endgroup$ – H98 Oct 12 at 11:15
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When you integrated, you ignored the fact that $I_\nu$ depends on $\theta$.

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  • $\begingroup$ I've got this far: $\frac{1}{\kappa_\nu \rho} \frac{dB_\nu}{d\nu} \int \int -cos^2 \theta sin \theta d\theta d\phi$ $\endgroup$ – H98 Oct 9 at 20:27

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