Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 20 - Think and Discuss: 88

Answer

When one uses shorter wavelength waves to form an image, more detail can be resolved. Ultrasound has short wavelengths, allowing for better images. This is why blue light is sometimes used in optical microscopes, and why using x-rays or electrons produce far better microscopic images. If you are curious, the reason that short wavelengths produce better images is that microscopes are "diffraction-limited". Try looking up the term "Rayleigh criterion" for a quantitative treatment of the problem.
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