Question

Calculate the energy radiated in one minute by a blackbody of surface area 100 cm² when it is maintained at 227 ºC. 

Answer 1

Given: t = one minute = 60 s, A = 100 cm² = 100×10^-4 m² = 10^-2 m², T = 273 + 227 = 500 K,

σ= 5.67×10^-8 W/m².K⁴

The energy radiated, Q = σAT⁴t

= (5.67×10^-8)(10^-2)(500)⁴(60) J

= (5.67)(625)(60)(10^-2)J = 2126 J