Agricultural Engineering > GATE 2023 > Heat Transfer
A copper ball and a steel ball having diameters d1 and d2, respectively, are initially at a uniform temperature of 200°C. Both the balls are exposed to the atmosphere at 30°C. If both the balls attain a temperature of 120°C after equal exposure duration, then the ratio of d1 to d2 is _______. (rounded off to 3 decimal places, Assume Biot Number to be less than 0.1)
Material: Copper, Steel
Density (kg m-3): 8950, 7800
Specific heat (J kg-1 °C-1): 383, 460
Thermal conductivity (W m-1 °C-1): 386, 36
Material: Copper, Steel
Density (kg m-3): 8950, 7800
Specific heat (J kg-1 °C-1): 383, 460
Thermal conductivity (W m-1 °C-1): 386, 36
Correct : 0.456
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