An α particle and a proton are subjected to the same magnetic field B. B is perpendicular to the velocity vectors of the particles. The radii of their paths are equal to each other. The ratio of their de-Broglie wavelength is
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An α particle and a proton are subjected to the same magnetic field B. B is perpendicular to the velocity vectors of the particles. The radii of their paths are equal to each other. The ratio of their de-Broglie wavelength is