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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$y = \frac{1}{{\sqrt a }}\,\sin \,\omega t \pm \frac{1}{{\sqrt b }}\,\cos \,\omega t$ will be

