Physics (AS & A Level) · May / June 2023 · Paper 12 · Question 40

A $\pi^{+}$ meson has a charge of +e, where e is the elementary charge. It consists of an up quark and one other quark. What could be the other quark in the $\pi^{+}$ meson?

1. Aanti-down
2. Banti-up
3. Cbottom
4. Dcharm

As printed in the paper