Physics (AS & A Level) · Feb / March 2021 · Paper 12 · Question 40
The nuclei of common isotopes of hydrogen, helium, lithium and beryllium are shown. Which nucleus contains equal numbers of up and down quarks?
- A$^{1}_{1}\text{H}$
- B$^{4}_{2}\text{He}$
- C$^{7}_{3}\text{Li}$
- D$^{9}_{4}\text{Be}$
As printed in the paper
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Correct answer: B. $^{4}_{2}\text{He}$
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