Black Body

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Diane Kang 2F
Posts: 33
Joined: Fri Sep 28, 2018 12:18 am

Black Body

Postby Diane Kang 2F » Thu Nov 01, 2018 12:16 am

The textbook defines a 'black body' as an "object that absorbs and emits all frequencies of radiation without favor." However, quantum mechanics is all about energy existing in packets and thus limit to certain frequencies, meaning not "all" frequencies of radiation is possible.

Considering quantum mechanics, does the definition of a black body still hold true?

Patrick Cai 1L
Posts: 93
Joined: Fri Sep 28, 2018 12:25 am

Re: Black Body

Postby Patrick Cai 1L » Thu Nov 01, 2018 2:10 pm

Given that blackbody radiation was observed as a macroscopic effect, the generalizations produced by classic blackbody radiation theory holds true for classic mechanics. However, if we were to consider the quantized nature of matter, increasingly specific analyses of blackbody radiation fails at the atomic level, making the blackbody radiation idea void if quantum mechanics are the dominant effect.

IScarvie 1E
Posts: 66
Joined: Sat Aug 17, 2019 12:16 am

Re: Black Body

Postby IScarvie 1E » Thu Oct 10, 2019 2:12 pm

Black bodies are an idealization; an actual black body that emits and absorbs all frequencies does not exist. Stars are approximately like black bodies, but not exactly

rachel liu 3k
Posts: 56
Joined: Sat Aug 17, 2019 12:16 am

Re: Black Body

Postby rachel liu 3k » Thu Oct 10, 2019 7:21 pm

Are black bodies related to black holes?

Bradley Whitworth 4B
Posts: 54
Joined: Sat Jul 20, 2019 12:17 am

Re: Black Body

Postby Bradley Whitworth 4B » Thu Oct 10, 2019 10:42 pm

The idea of Black Body is theoretical in that if an object truly did absorb and emit all frequencies of light it would actually be invisible. So, if you're looking to invent invisibility this is a good place to start. :)

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