Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Transcribed Image Text:Q.2(
Calculate the equilibrium number of vacancies per cubic meter for copper at 160 and 927 C. The energy for
vacancy formation is 0.9 eV/atom; the atomic weight and density for copper are 63.5 g/mol and 8.4 g/cm³,
respectively.
Q.3 (
Suppose we count 18 grains per square inch in a photomicrograph taken at magnification 300x. What is the
ASTM grain size number (n)?
Q.4(
A sheet of BCC iron (Fe purity is 99.988 wt% ) 1 mm thick was exposed to a carburizing gas atmosphere on
one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the
iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces of the sheet
were determined to be 0.015 and 0.0065 wt%.
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