The ratio of time period is 4:3
The time for the charged particle to go around the circular path is the period.
T = Circumference/Speed
Where r is radius of curvature of the moving charge q,
m is the mass and
v is the velocity of the charged particle and
B is magnetic field.
T1/ T2 = (2πm1/q1B) / (2πm2/q2 B) = m1q2 / m2q1 = 2 x 2 / 3x1 = 4 : 3