Metallurgical Engineering > GATE 2020 > Thermal Diffusivity
Two solid spheres X and Y of identical diameter are made of different materials having thermal diffusivities 100 × 10-6 m2 s-1 and 25 × 10-6 m2 s-1 respectively. Both spheres are heated in a furnace maintained at 1000 K. If the center of the sphere X reaches 800 K in 1 hour, time required for the center of sphere Y to reach 800 K is _______.
Correct : c
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