Question a 21-cm-diameter metal sphere is glowing red but a, Ask an Expert

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Question: A 2.1-cm-diameter metal sphere is glowing red, but a spectrum shows that its emission spectrum peaks at an infrared wavelength of 2.2 µm.

A- How much power does the sphere radiate?

Can someone please explain what the heck is going on? Hint: Assume the metal sphere is a blackbody.

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