Two coaxial parallel disks of equal diameter 1 m are originally placed at a distance of 1 m apart. If both disks behave as black surfaces, determine the new distance between the disks such that there is a 75% reduction in radiation heat transfer rate from the original distance of 1 m.

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Q: collisions transfer energy

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Q: & = 0,2 - 0.2 T, - 800 K E =0.7 T, = 500 K

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