1.

\[\pi \]mesons can be                                                   [RPET 1997]

A.            \[{{\pi }^{+}}\]or \[{{\pi }^{-}}\]                                       
B.            \[{{\pi }^{+}}\]or \[{{\pi }^{0}}\]
C.            \[{{\pi }^{-}}\]or \[{{\pi }^{0}}\]                                       
D.            \[{{\pi }^{+}},\ {{\pi }^{-}}\]or \[{{\pi }^{0}}\]
Answer» E.


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