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Unformatted text preview: . As the particles have the same velocity, they also have the same phase velocity. 4. Solution A. For photon: , For electron: From , B. From ,if energy is much higher than , then the equation is reduced to , so 5. Solution 1 The longest possible wavelength is . Momentum: By using Solution 2 (from previous year) Since the electron is supposed to be confined within the region, By uncertainty principle, Which mean the magnitude of p must be, on average , of this order. Then the kinetic energy is For reference , by particle in a box model, 6. Solution Length of group Number of wave Approx. min bandwidth is 12.5 MHz...
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