An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy ...

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

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