the source aperture from which a bean of 2-MeV helium ions emerge at a distance of 15cm from the sample. how long does it take for the one of these incident particles (each with mass 4 amu) to reach the target? (1 amu= 1.66 x 10^-27 kg, 1 eV= 1.60 x 10^-19 J)
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