Two parallel rectangular surfaces 1 cm ×2 cm are opposite to each other at a distance of 4 m. The surfaces are black and at 100°𝐶 and 200°𝐶 . The heat exchange between the two surfaces by radiation is:
A. 149.5 𝑊
B. 137.5 𝑊
C. 125.5 𝑊
D. 113.5 𝑊
Answer:A
Two parallel rectangular surfaces 1 cm ×2 cm are opposite to each other at a distance of 4 m. The surfaces are black and at 100°𝐶 and 200°𝐶 . The heat exchange between the two surfaces by radiation is:
A. 149.5 𝑊 B. 137.5 𝑊 C. 125.5 𝑊 D. 113.5 𝑊