Dir: [T11] Rotational symmetry?:-3-fold,-- 5. On observing the grain structure o

Question

Dir: [T11] Rotational symmetry?:-3-fold,-- 5. On observing the grain structure of a polished and etched metal sample, Alie counts 100 inter wholly within a 1"x1.5" box drawn on a micrograph with a 135X magnification. She also coun grains that intersect one edge of the box and four that intersect two edges. Calculate the ASIM gran athets 13s size number for this material? ANSWER: The grain count is: 100+135/2+ resizing the box we would N-168. Using the ASTM grain size formula, we have n-n +HE9] (1 pt for n) Note: we report ASTM grain size number asthe nearest whole number. 1168,5 in a l"x1.5" box. Upon demagnification and 15/204 .7 grains. (1 pt for grain count) erve: N-168. 204.7) 1 Where dicl this come froM? what idemag hity ing Formula s this

Explanation / Answer

It came from the magnification factor which is 135X denoting that the dimensions are increase by 1.35 times. Now while demagnifying both the dimensions should be divided by 1.35

That factor (1.35^2)/1.5 appears due to the divison of 1 by 1.35 and 1.5 by 1.35.

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.