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A-LevelPhysicsParticle physics9702/12 · Feb/Mar 2021 · Q401 Mark

The nuclei of common isotopes of hydrogen, helium, lithium and beryllium are shown. Which nucleus contains equal numbers of up and down quarks?

A¹₁H
B⁴₂He
C⁷₃Li
D⁹₄Be

✓ Correct answer

B: ⁴₂He

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About this question

Topic
Particle physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source
A-Level Physics, Feb/Mar 2021 Paper 1 Variant 2, question 40.

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