MCQ
$\pi$ mesons can be
- A$\pi^{+}$or $\pi^{-}$
- B$\pi^{+}$or $\pi^0$
- C$\pi^{-}$or $\pi^0$
- ✓$\pi^{+},\pi^{-}$or $\pi^0$
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(Given Planck constant $h = 6.6 \times {10^{ - 34}}J - sec$)