Question: According to ASTM E112 the grain size number is calculated as: N = 2(n-1) Where N is the number of grains per square inch

According to ASTM E112 the grain size number is calculated as: N = 2(n-1) Where N is the number of grains per square inch at 100x magnification and n is the ASTM grain size number. Note: that the higher the number the more grains there are. A prepared sample of metal reveals a structure with 81 grains per square inch at 100x magnification. a. 10 O b.7 O. 2 O d. 5 e. None of the above are the correct ASTM grain size number

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