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A blind cylindrical hole of 2 cm diameter and 3 cm length is drilled into a metal slab having emissivity 0.7. If the metal slab is maintained at 650 K, make calculations for the radiation heat escape from the hole
  • a)
    7 W
  • b)
    3 W
  • c)
    1 W
  • d)
    9 W
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A blind cylindrical hole of 2 cm diameter and 3 cm length is drilled i...
Q = E 1 A 1 σ b T 14 [1 – F 11/1 – (1 – E 1) F 11].
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