The translatability (τ) and absorptivity (α) of a perfectly black body are ____.

The translatability (τ) and absorptivity (α) of a perfectly black body are ____.

a. 0 and 1
b. 1 and 0
c. 0.5 and 0.5
d. None of the above

Correct Answer : a. 0 and 1

Explanation :

The body which absorbs all the incident radiation is known as perfectly black body. So only the absorptivity will be 1 and translatability and reflectivity will be 0.