The total emissive power of a surface is $$500$$ $$W/{m^2}$$ at a temperature $${T_1}$$ and $$1200$$ $$W/{m^2}$$ at a temperature $${T_2}$$, where the temperatures are in Kelvin. Assuming the emissivity of the surface to be constant, the ratio of the temperatures $${{{T_1}} \over {{T_2}}}$$ is

GATE 2015 Mechanical Engineering PYQ — Heat Transfer

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Heat Transfer · Radiation

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Radiation has appeared in GATE Mechanical Engineering 21 times across 18 years (2014, 2015, 2016, 2022, 2023, ...).

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emissive powerstefan-boltzmann lawradiationtemperature ratio