What is Black Body?

[Kellylin_4D]

Can someone explain exactly what Black Body Radiation is and what is it for?

[thanh24mai]

So I'm not super sure, but I remember in lecture he was saying that a black body is something that absorbs radiation at all wavelengths.

[AKhanna_3H]

I also believe Dr. Lavelle said that it absorbs all radiation.

[Minh Ngo 4G]

An object that absorbs all EM radiation regardless of frequency

[Ashley Osorio]

From my understanding, black bodies is a misleading name because they're actually glowing white from how hot they are. Basically, they do absorb all wavelengths, but they don't reflect light, they radiate it. The amount of light emitted then depends on the temperature of the object being heated.

[Mai V 4L]

Does anyone know if this is going to be on the final?

[Anokhi Patel 2B]

What would it mean if we solved the black body dilemma, does that mean time travel.

[Darren1j]

If it absorbs all light, and you need light to be reflected off an object to see it, would a black body be ... invisible? How would that work? In fact, how would a black hole look through a telescope if we could get near one?

[Bella Bursulaya 3G]

A black body is a theoretical concept; it is an object that will absorb and/or emit all wavelengths of light. We don't know of any such objects to exist. I suppose if it's emitting light it should be detectable, but if it was just absorbing all light you wouldn't be able to see it. We may be able to detect it another way, I'm not sure. Perhaps through seeing how it manipulates gravity if it is big enough or if particles affect it. I am not quite sure, but it is a very interesting concept! Perhaps we can learn more about it in the book!

[Joey_Okumura_1E]

A black body is a hypothetical object that absorbs all frequencies of light.

[Joey_Okumura_1E]

Does anyone know if this is going to be on the final?

I do not think we will be tested on this since Dr. Lavelle told us we do not need to worry about it.

[Nayra Gharpetian 3F]

a black body is an object that emits/absorbs all frequencies of light. however, this is a theoretical concept because no such object exists.

[Eileen Quach Dis 2A]

A black body is a theoretical object that absorbs all frequencies of light. It doesn't exist in real life, and Professor didn't go in depth about it because we don't need to study it further.

[Sam_Marasigan_3D]

A black body absorbs all energy/radiation (light) that falls on it.

[Dominic Benna 2E]

Didn't Lavelle also say that we didn't necessarily need to know about Black Bodies for the course?

[Alexandra Salata 2L]

Dr Lavelle specifically said that black body radiation is more of a physics subject and that we won't need to know what it is or any detail about it for Chem14A.

[Andre Fabian 1F]

Hi there!

A black body is a substance that absorbs and emits all wavelengths. As such, because no light is reflected, black bodies are invisible to the eye. There are substances that exist that are very close property-wise to black bodies, yet there aren't any discoveries of actual substances meeting the full requirements of a "black body."



Hope this helps!
Andre

[Taylor K 2D]

A black body is something that absorbs all light, but Lavelle said we didn't need to know that.

[Kelly Yun 2I]

So theoretically, would it be black...?

[Shruti Kulkarni 2I]

Hi!!
Black body radiation is basically radiation that emits and can absorb all frequencies possible! It's a theorized concept but nothing in real life has this property.

[SophiaJenny3I]

Hi! So a black body is a theoretical concept, there is nothing that we know of that has the associated characteristics of a black body. A black body, theoretically, absorbs all frequencies, and thus doesn't reflect anything. Also, Dr. Lavelle said we didn't have to worry about this concept, it's just interesting to know for now.

[Yichen Fan 3A]

A black body is not really black, in fact you can never see it because it absorbs the lights of all frequencies and nothing will be reflected into your eyes. We call it a "black" body simply because black is the color that absorbs all the visible lights in our daily life which best resembles the theoretical model we created here.

[Karina Grover 1A]

A black body is an object that absorbs all EM radiation (any and all frequencies) and, in consequence, produces black-body radiation/black light.

[Shalyn Kelly 3H]

Hi! Bouncing off everyone above, black body radiation absorbs all light frequencies making it completely invisible. Currently, it is only a theoretical concept, because there're things close, but not quite invisible - also more of a physics one. Dr. Lavelle mentioned it a few times, but he also made sure to say that we won't have to worry about it (for tests and such).

[MichaelMendozaD1F]

I believe this concept will not be fully addressed until a more advanced chem lesson, however, I do recall him mentioning it being all consuming. I expect it to be in Chem 14B or further.

[Charlie Russell 2L]

Hey, so I just researched this question and thought I would come on Chem Comm and help some peers out.

"An example of a black body is a cavity with a small hole in it. Any light incident upon the hole goes into the cavity and is essentially never reflected out since it would have to undergo a very large number of reflections off walls of the cavity. If we make the walls absorptive (perhaps by painting them black), the cavity makes a perfect black body."

Hope this example might make the definitions stated make a little more sense!

[Madeline Ogden 3B]

Dr.Lavelle defined a "black body" as an object that absorbs all wavelengths of light. (Easy way to remember it is that on the visible light spectrum, white light is the presence of all colors of light, whereas black is the absence of all light). However, this is only a theoretical notion as such an object doesn't exist.

[Charlie Russell 2L]

Hey, so I just researched this question and thought I would come on Chem Comm and help some peers out.

"An example of a black body is a cavity with a small hole in it. Any light incident upon the hole goes into the cavity and is essentially never reflected out since it would have to undergo a very large number of reflections off walls of the cavity. If we make the walls absorptive (perhaps by painting them black), the cavity makes a perfect black body."

Hope this example might make the definitions stated make a little more sense!

I just also find out that they are pretty impossible and I think the closest to a perfect black body is a black hole!

[Gustavo_Chavez_1K]

Black body is essentially a surface that absorbs all incident radiation that hits it and, in turn, emits black body radiation. This concept is idealized though since there isn't any surface that is completely black.

[Susan Chamling 1F]

Black Body refers to a material that could, in theory, absorb all wavelengths of light, which renders it invisible due to no light reflecting off of its surface, which is required for us to see an object.

[Jeremy Wei 2C]

Hi, Lavelle went over this briefly during lecture, but essentially black body is a theoretical concept where a material would absorb all forms of wavelengths/frequencies of EM radiation, making it appear "black" (it would be invisible to our eyes).

[Sheryl Ocampo 1D]

I think it's the theoretical concept of a substance that absorbs or reflects all wavelengths of light

[Melanie Krahn 1C]

Hello all,
If I'm not mistaken, Dr. Lavelle specifically mentioned that we do not need to know what black body radiation is and we will not be tested on it.

[Eve Gross-Sable 1B]

He said in the lecture that we do not need to know about black body radiation for this class, but if it's just a curiosity thing I found this link pretty explanatory
http://galileo.phys.virginia.edu/classe ... ation.html

[AHUNT_1A]

absorbs EM radiation

[Brandon McClelland3L]

A black body is an object absorbs or emits all wavelengths of light.

[305561744]

So we refer to the theoretical "black body" as black because it absorbs all electromagnetic radiation. Is there also a "white body"? And if so, what're its theoretical uses?

[Edwin Montalvo 1G]

Test-wise, we do not have to know this for Chem 14A.

However, black body is an object that absorbs electromagnetic radiation of all frequencies, making it unique to chemistry. It is only a theoretical concept, though.

[Shannon Lau 14B - 1H]

Black body is an object for the most part or thing that absorbs all the radiation that has fallen or been emitted towards it. In other words, it is an ideal absorber of radiation and when light hits it, it does not reflect out for the most part. The black body does however also emit radiation but only when heated. When it is heated to a certain degree, all of the radiation could potentially emit off of it. But after reading some of our peer's responses, it doesn't seem like a topic to focus or worry too much about and it sounds like it won't be on the midterm.

[Isabella Yee 1F]

In one of the lectures, I believe Professor Lavelle stated that black bodies is a hypothetical material that can absorb or emit ALL frequencies. For example, black paint is closer to absorbing frequencies than blue paint.

[Abby 2B]

In lecture, Dr. Lavelle said that atoms and molecules only absorb/emit unique frequencies that are allowed by their unique electronic structure, and I think he used black bodies as an example as something that doesn't only absorb/emit unique frequencies. Black bodies can absorb all EM frequencies.

[Vanessa Wiratmo 3k]

Based on last week's lecture, Dr. Lavelle explained "blackbodies" as a material whether it be atoms or molecules that is able to absorb or emit "all" frequencies.
It is a hypothetical because no matter is able to do this. Some materials are better at absorbing and emitting frequencies such as black paint.

[Gianna Sciole 2F]

black body objects are objects that hypothetically can absorb/emit all frequencies and wavelengths of electromagnetic radiation. it's undetermined if such objects exist because hypothetically, these objects would become really hot and begin to glow.

[Ameen Shaheen 2I]

It’s hypothetical. All it is is a body that absorbs energy and light creating a black body, especially similar to thag of a black hole.

[Emily2J]

Does anyone know if this is going to be on the final?

He said he would go over it more in the future but we wouldn't be spending much time on it so I don't think its a very prominent topic.

[Luke Hatch 1G]

Black body radiation is just the radiation given off by everything that has energy (aka a temperature above 0 kelvin which is all objects). In the examples, the radiation is visible when because when some objects emit radiation as they are heated they produces light (like hot iron produces red light when it is heated).

[605607825]

Hello! From my understanding, when an object is being heated, it emits radiation and in the case of black body it is being emitted at all frequencies. It is known as a "perfect absorber" which means it practically absorbs energy. It is just a phenomenon!

[SheaZenker_3F]

It absorbs all wavelengths of light I think

[Sanjana Sivakumar 2E]

So we refer to the theoretical "black body" as black because it absorbs all electromagnetic radiation. Is there also a "white body"? And if so, what're its theoretical uses?

Hey!

There is such a thing as a white body and it's basically the exact opposite! White bodies are hypothetically a substance or thing that absorbs no electromagnetic radiation at all! So it reflects everything.

Hope this answer's your question!

[405509920]

I'm not sure if anyone has mentioned this yet but I know a couple years back there was a color "invented" called VantaBlack that supposedly absorbed up to 99.7% of light. Would we consider this to be something approaching the theoretical black body since it absorbs the vast majority of the light spectrum?

[505749458]

Black body does not actually exist in nature, but it's a theoretical entity that can accept every form of EM radiation, so its spectrograph would show reflection of every single frequency.

[405566265]

can someone clarify if black body and black box are two different kinds of radiation?

[Aaron Kim 1J]

A black body is an object that absorbs all electromagnetic radiation regardless of frequency. Its name comes from its ability to absorb all colors of light.

[GoldDigger]

I think I remember Dr. Lavelle saying that its hypothetical, but its an object that absorbs all wavelengths and radiation.