For most practical temperature we may take it that all bodies radiate heat in proportion to the fourth power of temperature T. If a body (coated$$ $$black) at $$400$$ K surrounded by atmosphere at $$300$$ Khas cooling rate $$r0$$, the same body at $$900$$ K, surrounded by the same atmosphere, will have cooling rate closer to

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Infinity Learn · Accepted Answer

According to Stefan's law, $$r0=$$σ$$4004$$−$$3004$$ and $$r=$$σ$$9004$$−$$3004rr0=(900)4$$−$$(300)4(400)4$$−$$(300)4=163$$∴ $$r=81$$ ×$$80175r0$$

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