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A 2.0-cm-diameter metal sphere is glowing red, but a spectrum shows that its emission spectrum peaks...

A 2.0-cm-diameter metal sphere is glowing red, but a spectrum shows that its emission spectrum peaks at an infrared wavelength of 2.1 μm . Assume e=1.

Part A

How much power does the sphere radiate?

Express your answer to two significant figures and include the appropriate units.
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