The Alpha Particles from a Naturally Radioactive Decay Have a Kinetic

question 19

Multiple Choice

The alpha particles from a naturally radioactive decay have a kinetic energy of 4.25 MeV.How close does an alpha particle come within a gold nucleus if the particle is heading directly towards the nucleus? Give your answer in terms of number of radii of the gold atom,r = 7.0 fm.

• A)2
• B)8
• C)12
• D)15
• E)19

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