Amaterial has an astm grain size number of 7. determine the magnification, if the number of grains per square inch observed is: i. 64 grains/in ii. 500 grains/in? iii. 20 grains/in-

A) M = 100X

B) M = 36X

C) M = 178.88X

Explanation:

Given data:

ASTM grain size number 7

a) total grain per inch^2 - 64 grain/inch^2

we know that number of grain per square inch is given as

where M is magnification, n is grain size

therefore we have

solving for M we get

M = 100 X

B)  total grain per inch^2 = 500 grain/inch^2

we know that number of grain per square inch is given as

where M is magnification, n is grain size

therefore we have

solving for M we get

M = 36 X

C) Total grain per inch^2 = 20 grain/inch^2

we know that number of grain per square inch is given as

where M is magnification, n is grain size

therefore we have

solving for M we get

M = 178.88 X