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# Three particles $\alpha- particle,$ proton and deuteron are acceleration by the same potential difference. The velocities of them are in the ratio:

$\begin {array} {1 1} (1)\;1: \sqrt 2: 1 & \quad (2)\; \sqrt 2 : 1 : 1 \\ (3)\;1 : 2 :4 & \quad (4)\;4 :2 : 1 \end {array}$