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The temperature of a metal block is increased from 27⁰C to 84⁰C. The rate of radiated energy

The temperature of a metal block is increased from 27⁰C to 84⁰C. The rate of radiated energy from the block will increase approximately

Options

(a) 2 times
(b) 4 times
(c) 8 times
(d) 16 times

Correct Answer:

2 times

Explanation:

By Stefan’s law, E₂/E₁ = [(273 + 84)/(273 + 27)]⁴
⇒ E₁/E₁ = (357/300)⁴ = (119/100)⁴
⇒ E₁/E₁ = (1.19)⁴ ≈ 2.

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