AIIMS 2017 Physics Nuclear Size Assertion Reason Question
Assertion: The positively charged nucleus of an atom has a radius of almost 10⁻¹⁵ m. Reason: In α particle scattering experimenting, the distance of closest approach for α-particles is ≈ 10⁻¹⁵ m.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Option A is correct because both the assertion and reason are true; the nucleus of an atom does indeed have a radius on the order of 10⁻¹⁵ m, and this value corresponds to the distance of closest approach for α-particles in scattering experiments, indicating the size of the nucleus. Option B is incorrect because the reason does explain the assertion. Option C is incorrect as both statements are true, and option D is incorrect since both statements are factual. Understanding the size of the nucleus and its interaction with α-particles is crucial in nuclear physics and helps illustrate the scale of atomic structures.
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