Essentials of Materials Science and Engineering, SI Edition
Essentials of Materials Science and Engineering, SI Edition
4th Edition
ISBN: 9781337672078
Author: ASKELAND, Donald R., WRIGHT, Wendelin J.
Publisher: Cengage Learning
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Chapter 6, Problem 6.56P
Interpretation Introduction

Interpretation:

The macro-hardness and micro hardness needs to be explained.

Concept introduction:

The macro-hardness and micro hardness are the two ranges of hardness testing.

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A piston–cylinder device contains 3 kg of nitrogen initially at 100 kPa and 25°C. Nitrogen is now compressed slowly in a polytropic process during which PV1.3 = constant until the volume is reduced by one-half. Determine the work done and the heat transfer for this process. The gas constant of N2 is R = 0.2968 kPa·m3/kg·K. The cv value of N2 at the anticipated average temperature of 350 K is 0.744 kJ/kg·K (Table A-2b).   The work done for this process is  kJ. The heat transfer for this process is  kJ.
I tried solving this one but I have no idea where I went wrong can you please help me out with this?
a. An average hole drift velocity of 103 cm/sec results when 2V is applied across a 1 cm long semiconductor bar. What is the hole mobility inside the bar? b. Name the two dominant carrier scattering mechanisms in nondegeneratedly doped semiconductors of device quality. c. For a give semiconductor the carrier mobilities in intrinsic material are (choose one: higher than, lower than, the same as) those in heavily doped material. Briefly explain why the mobilites in intrinsic material are (chosen answer) those in heavily doped material.

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Essentials of Materials Science and Engineering, SI Edition

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