α-particles, deuterons and protons of same energy are moving in a perpendicular

α-particles, deuterons and protons of same energy are moving in a perpendicular magnetic field. The ratio of diameters of their circular paths will be

Options

(a) (1:√2:1)
(b) (√2:1:1)
(c) (2:1:1)
(d) (1:1:2)

Correct Answer:

(1:√2:1)

Explanation:

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