122 An alpha particle is accelerated to a velocity v in a particle accelerator by a potential difference of 1200 V . Which of the following potential differences would be needed to give the alpha particle twice the velocity?
(A) 4800 V
(B) 4100 V
(C) 2400 V
(D) 1700 V
(A) 4800 V
(B) 4100 V
(C) 2400 V
(D) 1700 V