Figure 9-25 shows a photograph of FeO dendrites that have precipitated from an oxide glass (an...

Figure 9-25 shows a photograph of FeO dendrites that have precipitated from an oxide glass (an undercooled liquid). Estimate the secondary dendrite arm spacing.

Figure 9-25 Micrograph of FeO dendrites in an oxide glass (×450) (for Problem 9-41) (Courtesy of C.W. Ramsay, University of Missouri—Rolla.)