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Two Problems in Modern Physics

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28. A wave packet describes a particle having momentum p. Starting with the relativistic relationship E^2 = p^2 c^2 + E0^2, show that the group velocity is Bc and the phase velocity is c/B (where B = v/c). How can the phase velocity physically be greater than c?

44. An electron microscope is designed to resolve objects as small as 0.14 nm. What energy electrons must be used in this instrument?

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Solution Summary

We solve two problems in modern physics, one involving group and phase velocities and one involving the resolution of an electron microscope.

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