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A particle accelerator boosts a proton's kinetic energy so that the de Broglie wavelength of the proton is 4.2 x 10^-15 m. What is the kinetic energy of the proton?
A. 3.0 x 10⁸ eV
B. 4.5 x 10⁷ eV
C. 5.2 x 10⁶ eV
D. 6.2 x 10³ eV
E. 1.0 eV

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