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Assignment04

# Assignment04 - City University of Hong Kong Electronic...

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HW4-1 City University of Hong Kong Electronic Engineering Semester B 2007-2008 EE3108 Engineering Analysis Assignment 4 Deadline: 5:00pm, 18 Apr 2008 (Room G6354) Please put down your name, university ID and the time-slot of your tutorials. 1. In a piece of semiconductor, the electric current is carried by electrons and holes. When electrons recombine with holes, the normalized charge density n ( t ) decreases. For a particular sample, we have: 3 2 cn bn an dt dn = , where a = 1.5, b = 2 × 10 2 and c = 4 × 10 −4 . The initial normalized density is n (0) = 100. (a) By hand-calculation, find n (0.5) using the Euler’s method with a step size of h = 0.1. (b) Using Matlab, plot n ( t ) against t . Obtain the plot using the Huen’s method for t = 0 to 1 with step size of h = 0.01. Attach a hardcopy of the graph. (c) Save the Matlab script file for Part (b) as hw0401.m . Upload the file to Blackboard and attach a hardcopy with the homework. You can upload extra files if it is necessary.

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Assignment04 - City University of Hong Kong Electronic...

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