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Question Number 58286 by Umar last updated on 21/Apr/19

$$\mathrm{A}\mathrm{small}\mathrm{body}\mathrm{with}\mathrm{temperature}\theta \mathrm{and}$$$$\mathrm{absorbtivity}\tau \mathrm{is}\mathrm{placed}\mathrm{in}\mathrm{a}\mathrm{large}$$$$\mathrm{evaluated}\mathrm{capacity}\mathrm{whose}\mathrm{interior}$$$$\mathrm{walls}\mathrm{are}\mathrm{at}\mathrm{a}\mathrm{temperature}{\theta }_{\mathrm{w}}.$$$$\mathrm{when}{\theta }_{\mathrm{w}}-\theta \mathrm{is}\mathrm{small},\mathrm{show}\mathrm{that}\mathrm{the}$$$$\mathrm{rate}\mathrm{of}\mathrm{heat}\mathrm{transfer}\mathrm{by}\mathrm{radiation}\mathrm{is}$$$$\stackrel{\bullet }{\mathrm{Q}}=4{\theta }_{\mathrm{w}}^3\mathrm{A}\tau \delta ({\theta }_{\mathrm{w}}-\theta ).$$

Commented by Umar last updated on 21/Apr/19

$$\mathrm{help}\mathrm{please}$$

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