A cosmic-ray proton has a de Broglie wavelength of 0.020 fm. What is its kinetic energy? Use

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A cosmic-ray proton has a de Broglie wavelength of 0.020 fm. What is its kinetic energy? Use the relativistic relations for momentum and energy along with de Broglie’s relation for the wavelength of a particle-wave in Equation 28.9.

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