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PhysicsJEE Main 21 Jan 2026, Shift 1·Q13·MCQ·Easy–moderate

Atoms · Atomic models

If an alpha particle with energy 7.7 MeV is bombarded on a thin gold foil, the closest distance from nucleus it can reach is m. (Atomic number of gold =79= 79 and 14πϵ0=9×109\dfrac{1}{4\pi\epsilon_0} = 9\times10^{9} in SI units)
  1. (1)2.95×10−142.95\times10^{-14}
  2. (2)2.95×10−162.95\times10^{-16}
  3. (3)3.85×10−163.85\times10^{-16}
  4. (4)3.85×10−143.85\times10^{-14}

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