13 Based on the results of Experiment 1, approx-
imately how long, from time zero, did it take the
voltmeter to reach a reading of 10.7 V?
A. Less than 10 sec.
B. Between 10 and 20 sec.
C. Between 20 and 40 sec.
D. More than 40 sec.

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

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