EECE 7201, Homework #2, Due Jan. 31, 2011
1. Problem 1.7, text.
2. Problem 1.9, text.
3. Problem 1.14, text.
4.
For GaAs, how many Ga atoms are in each conventional cubic unit cell?
In a primitive unit cell?
For Si, how many atoms are in each conventional cubic unit cell?
In a primitive unit cell?
5. Problem S1A.8, text.
Hint:
Because the function does not need to go to zero at x=0, both sine and
cosine functions can be solutions, and the solutions alternate!
6. a. Determine an approximate ground state energy for a basketball in a gym!!
Use (very)
approximate masses and sizes.
You can assume a onedimensional gym.
b. To what energy level does motion across the gym at 30 miles/hour correspond? (What is the
approximate quantum number, "n"?)
c. Does the quantum formulation reduce to the expected, nonquantized classical result? Explain.
7. a. Determine the product of the uncertainty in momemtum and position,
Δ
p
Δ
x, for the n=4 state in
the infinite potential well.
b. How does the result compare with that expected from the uncertainty principle?
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This note was uploaded on 03/22/2012 for the course ECE G201 taught by Professor Nm during the Spring '11 term at Northeastern.
 Spring '11
 NM

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