A neutral atom of atomic mass number I 0...

A neutral atom of atomic mass number I 00 which is stationary at the origin in gravity free space emits an a-particle (A) in z-direction. The product ion is P. A uniform magnetic field exists in the x-direction. Disregard the electromagnetic interaction between A and P. If the angle ofrotation of A after which A and P will meet for the first time is `(npi)/(25)` radians, what is the value of n?

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