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If ${\lambda _p}$ and ${\lambda _\alpha }$ be the de-Broglie's wavelengths associated with protons and $\alpha  - $ particles of equal kinetic energies, then

• A
  ${\lambda _p} = \frac{{{\lambda _\alpha }}}{4}$
• B
  ${\lambda _p} = \frac{{{\lambda _\alpha }}}{2}$
• C
  ${\lambda _p} = {\lambda _\alpha }$
• ✓
  ${\lambda _p} = 2{\lambda _\alpha }$