Reflect: For a given wavelength a photon has much more energy than an electron, which in turn has more energy than a proton. 28.44. Set Up: When a particle with magnitude of charge e is accelerated through 800 V, the final kinetic energy of the particle is 800 eV. so and Solve: (a) (b) 28.45. Set Up: Both for particles with mass (electrons) and for massless particles (photons) the wavelength is related to the momentum p by But for each type of particle there is a different expression that relates the energy E and momentum p . For an electron but for a photon Solve: photon and so and electron Reflect: The wavelengths are quite different. For the electron and for the photon so for an electron is proportional to and for a photon is proportional to It is incorrect to say for a parti-cle such as an electron that has mass; the correct relation is 28.46. Set Up: The Heisenberg Uncertainty Principle says The minimum allowed is Solve: (a) (b) 28.47. Set Up: The wavelength of the photon is related to the transition energy
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