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1. According to the uncertainty principle, can a particle having a kinetic energy of exactly zero be con?ned somewhere in a box of length L? Explain.

2. What is similar about the conjugate variable pairs (px, x), (E, t), (L, (J), and (I, w)?

3. What are the dimensions of the wave function Ψ (x, t) that describes matter waves? Give your reasoning.

4. Soon after their discovery, Davisson and Germer were using their experimental technique to describe new crystal structures of nickel. Do you think they were justi?ed? Explain how you think their results allowed them to make such statements.

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