North Seattle Community College
Spring 2011
NANO230
Homework 1
Due in class Monday, April 18
1. Compare the theoretical resolution limit of a light microscope and an electron
microscope. The wavelength of electrons is about 0.004 nm. Assume the angle α
of an electron microscope is 6 degrees, and the transmission medium is a
vacuum.
2. Draw and label a diagram of a drop of water on the smooth SiO2 surface of a
silicon wafer, including the angle θγ. Draw and label another diagram of a drop of
water on a rough SiO2 glass surface. Explain the difference in θγ (contact angle)
between the two cases.
3. Pick one of the following to answer:
A. Draw and label a simple diagram of the human eye. Explain how
contrast arises in the human eye. Determine and explain the resolution
limit of the human eye.
B. Look up one of the characterization methods that you had never heard
of before from the list we reviewed the first day of class. Draw and label a
diagram of the method. Explain the input, output, and how contrast is
achieved.