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Nucleus .(92)U^(238) emits alpha-particl...

Nucleus `._(92)U^(238)` emits `alpha`-particle `(._(2)He^(4))`. `alpha-`particle has atomic number 2 and mass number 4. At any instant `alpha-`particle is at distance of `9 xx 10^(-15)m` from the centre of nucleus of uranium. What is the force on `alpha-`particle at this instant?
`._(92)U^(238) rarr ._(2)He^(4) + ._(90)Th^(234)`

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