can the black hole be considered as a black body.?

Question

black body radiations?

Answer 1

black holes actually do emit radiation (because of some complicated vacuum fluctuations around them), so they are no perfect black bodies.
But yes, pretty damn close. They will absorb all light falling into them, which is the definition of a black body.
The question of whether you can call a hole "a body" is interesting but rather philosofical :-)

Answer 2

Of course black hole can be considered as a black body. Look a black body absorbs all radiations incident on them and do not re emit them, similarly a black hole absorbs the radiations and do not re-emit them. They are the last phase of stars and the gravitational force is so large that even the radiations emitted by the actual star don't escape the atnopsphere of the star and hence for us it appears as a dark black spot. Now u see any black body, u see it as black coz one and only reason that it absorbs all the radiations and do not re-emit them, hence no colour and hence a dark balck spot. Great question.

Answer 3

Ferry's Black Body

Answer 4

hi
you can concider black hole as black body beacuse u cant see it even the light cant pass through it beacuse of its gravity.It will be rotating in its axis it will takes the object into its center.Take a cup of tea and spin the tea with help of spoon in the same way it will be rotating if u drpo any small object it will be taken to the ceter.
black body radiation is different from black hole.Black body radiation occurs in sun

Answer 5

you can't call a black hole a black body. because the black body is one which absorbs all the radiations incident on it, and one more thing is according to physists there is no perfect black body exist in the nature. thus, it is called an ideal body. the black hole is the matter left after the death of a star. it is collapsed matter under its own gravity. it absorbs everything which is near to it. it absorbs not only the radiation, all the matters near to it. hence we can't call the black hole a black body.

Answer 6

NO. A balckbody only absorb the radioations falling on it not the matter, while a black hole absorbs all type of radiations as well as the matters due to its trimendus gravitational field. Blackbody is a hypothetical thing while black-hole is a reality.

Answer 7

They are not same. A blackbody will bounce a ball thrown at it. Where as a black hole will not bounce anything back including radiation and the mass falling in to it. Blackhole uses the gravity to absorb matter where as the blackbody has zero reflectivity to the radiation

Answer 8

yes u can call a black hole as black body but not a perfectly black body
for e.g u must be knowing ferry's black body example
in that case the hole itself is a black body
however the only perfectly black body in the universe is sun
as it can emit all the radiations from infra to ultra
and one which can emit can absorb
using this justification sun can be proved as a perfectly black body ( according to kirchoff's law good emitters are good absorbers and vice versa)

Answer 9

No. I am really surprised at how many people are really dumb and give false answers in such forums. This makes me wonder about the answers I get from such websites :(

Regarding Black bodies and Black holes we are dealing with 2 different subjects here. Blackholes - in Astronomy and Blackbodies in Thermal Physics. In lay mans Language, your question is like asking are Apples and Eggs the Same..? and the Obvious answer is NO. They are completely different. Please Refer the book Blackholes and baby universes by Steven Hawkins for more Clarifications. Hope this Helps.

Answer 10

i don't think so. since the information about it is very less we call it black hole. black in the sense unknown.