Determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron–carbon alloy that initially contains 0.10 wt% c. the surface concentration is to be maintained at 0.90 wt% c, and the treatment is to be conducted at 1,100°c (1,373 k). the iron is γ-fe with preexponential d0 = 2.3 10-5 m2 /s and activation energy qd = 148,000 j/mol.

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.

How are period and frequency related to each other? dperiod is the reciprocal of frequency.

Ithink c because you have to work to become goid

Number of electron i think