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6.12 An electron and a proton are detected in a cosmic ray experiment, the first with kineticenergy 10 keV, and the second with 100 keV. Which is faster, the electron or theproton ? Obtain the ratio of their speeds (electron mass 9 1 1x10 31 kg, proton mass1 67x10 27 kg, l eV = 1 60×10J) |
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