$\pi$ mesons can be
Answer & explanation
Correct answer: option 4
$p \rightarrow \pi^{+}+n, \quad n \rightarrow p+\pi^{-}$ and $n \rightarrow n^{\prime}+\pi^0$
$\pi$ mesons can be
Correct answer: option 4
$p \rightarrow \pi^{+}+n, \quad n \rightarrow p+\pi^{-}$ and $n \rightarrow n^{\prime}+\pi^0$