MJ22 P23 Q7 Fluorine Beta+ Decay and Quark Change | May/June 2022 | Cambridge A Level 9702 Physics

9702/23/M/J/22: (a) Fluorine‑18 is an isotope that decays to an isotope of oxygen (O) by the emission of a β+ particle.
(i) Complete the nuclear equation for the decay, including all the particles involved.
(ii) A quark in the fluorine‑18 nucleus changes flavour during the decay. State this change of flavour.

(b) A hadron has a charge of –2e, where e is the elementary charge.
(i) State and explain whether the hadron is a meson or a baryon.
(ii) State a possible quark composition for the hadron.
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