A black body is defined as an object which
(A) looks black.
(B) absorbs all e-m radiation equally.
(C) absorbs all e-m radiation completely.
(D) reflects all e-m radiation.
A black body is defined as an object which
(A) looks black. --- No.
Absorbing all visible light is not enough.
A black body is defined as an object which
(B) absorbs all e-m radiation equally.
No. That would be a grey body.
A black body is defined as an object which
(C) absorbs all e-m radiation completely.
Yes. Like a hole in a very large box.
A black body is defined as an object which
(D) reflects all e-m radiation.
No. That would be a white body.