5.12 An electron and a proton are detected in a cosmic ray experiment

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

5.12 An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy 10 keV , and the second with 100 keV . Which is faster, the electron or the proton ? Obtain the ratio of their speeds. (electron mass =9.11×10−31 kg=9.11 \times 10^{-31} \mathrm{~kg}, proton mass =1.67×10−27 kg,1eV=1.60×10−19 J=1.67 \times 10^{-27} \mathrm{~kg}, 1 \mathrm{eV}=1.60 \times 10^{-19} \mathrm{~J}).

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