The de-Broglie wavelength $(\lambda)$ for electron $(e)$, proton $(p)$ and $He^{2+}$ ion $(\alpha)$ are in the following order. (Speed of $e$, $p$ and $\alpha$ are the same)
- A$\alpha > p > e$
- B$e > p > \alpha$
- C$e > \alpha > p$
- D$\alpha < p > e$
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