Question

Assertion :The positively charged nucleus of an atom has a diameter of almost ${10}^{-15}m$. Reason: In $\alpha$-particle scattering experiment, the distance of closest approach for $\alpha$-particles is $\approx {10}^{-15}m$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

The Rutherford scattering experiment determined the size of nucleus of atom. The positively charged $\alpha$ particles were projected towards the positively charged nucleus of atom, and they suffered electrostatic repulsion, and hence could approach only upto a limit, which was around the order of proposed size of nucleus.