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PhysicsJEE Main 22 Jan 2026, Shift 1·Q2·MCQ·Easy–moderate

Atoms · Atomic models

7.9 MeV α\alpha–particle scatters from a target material of atomic number 79. From the given data the estimated diameter of nuclei of the target material is (approximately) m. [14πϵ0=9×109 Nm2/C2 and electron charge=1.6×10−19 C]\left[\dfrac{1}{4\pi\epsilon_0} = 9\times10^{9}\ \mathrm{Nm^2/C^2}\ \text{and electron charge} = 1.6\times10^{-19}\ \mathrm{C}\right]
  1. (1)5.76×10−145.76\times10^{-14}
  2. (2)1.44×10−131.44\times10^{-13}
  3. (3)2.88×10−142.88\times10^{-14}
  4. (4)1.69×10−121.69\times10^{-12}

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