MCQ
In an $EMW$ phase difference between electric and magnetic field vectors $\vec E$ and $\vec B$ is
- ✓$0$
- B$\pi /2$
- C$\pi$
- D$\pi /4$
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$A.$ Energy spectrum of $\alpha-$ particles emitted in radioactive decay is discrete
$B.$ Energy spectrum of $ \beta -$ particles emitted in radioactive decay is continuous

