Calculate the de Broglie wavelength of (a) an electron of kinetic energy 54 eV, (b) a proton of kinetic energy 70 MeV, (c) a 100 g bullet moving at 1200 m s-1, and Useful data: mec² = 0.511 MeV, m pc² = 938.3 MeV, ħc = 197.3 eV nm.

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