The range of emissivity (ϵ) in radiation is:

1
0 ≤ ϵ ≤ ∞
2
-∞ ≤ ϵ ≤ +∞
3
0 ≤ ϵ ≤ 1
4
1 ≤ ϵ ≤ ∞
5
-∞ ≤ ϵ ≤ 1

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