Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning - Discussion
Discussion Forum : Heat Transfer, Refrigeration and Air Conditioning - Section 2 (Q.No. 18)
18.
The emissivity for a black body is
Discussion:
12 comments Page 1 of 2.
Ashish mali said:
6 years ago
Emissivity is the ratio of emissive power of any body to emissive power of the black body.
So, for the black body it is 1.
So, for the black body it is 1.
Ashok Kumar chauhan said:
9 years ago
Emissivity means how much energy the body absorbed or emitted.
Black body absorbs all energy falling on it.
Black body absorbs all energy falling on it.
Ayo said:
7 years ago
By definition, a black body in thermal equilibrium has an emissivity of ε = 1.0.
Birendra kumar verma said:
4 years ago
For black body Absorptivity is 1 and Emissivity will be 0 only.
Munavvar said:
2 years ago
The emissivity of the black body is one. Not zero.
Raju said:
7 years ago
For black body it is 1.
For white body it is 0.
For white body it is 0.
Akash said:
9 years ago
It is 0. I'm sure with this answer.
Baby said:
8 years ago
Emissivity of black body is one.
Dhiraj said:
8 years ago
I am sure. It should be zero.
Arpit said:
9 years ago
I think it should be zero.
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