(Wien's law: )
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A black body is a surface or object that absorbs all wavelengths of light/doesn't reflect any light. I believe Dr. Lavelle said that there aren't any objects with true blackbody characteristics, and therefore, we aren't going to learn much about them in this class.
I think the purpose of Dr. Lavelle discussing black bodies in class was just so we know they exist; it is likely a topic that will come up again in succeeding chemistry classes but not 14A. Don't stress :)
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