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A proton and an alpha particle move in c...

A proton and an alpha particle move in circular orbits in a uniform magnetic field. Their speeds are in the ratio of 9:4 . The ratio of radii of their circular orbits `((r_(p))/(r_("alpha")))` is

A

`(3)/(4)`

B

`(4)/(3)`

C

`(8)/(9)`

D

`(9)/(8)`

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