A-LevelPhysicsNuclear physics9702/12 · Oct/Nov 2009 · Q391 Mark

Two α-particles with equal energies are fired towards the nucleus of a gold atom. Which diagram best represents their paths? [Figure 39.1]

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APath A: one α-particle deflects sharply backwards, another deflects by a smaller angle.

BPath B: one α-particle deflects sharply backwards, another passes straight through.

CPath C: one α-particle deflects slightly, another deflects even less.

DPath D: both α-particles deflect sharply backwards.

✓ Correct answer

B: Path B: one α-particle deflects sharply backwards, another passes straight through.

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Topic: Nuclear physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2009 Paper 1 Variant 2, question 39.

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