$A$ charged particle is accelerated from rest through a certain potential difference. The de-Broglie wavelength is $\lambda_1$ when it is accelerated through $V_1$ and is $\lambda_2$ when accelerated through $V_2$. The ratio $\lambda_1 / \lambda_2$ is
- A$V_1^{3/2} : V_2^{3/2}$
- B$V_2^{1/2} : V_1^{1/2}$
- C$V_1^{1/2} : V_2^{1/2}$
- D$V_1^2 : V_2^2$
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