1.

Ionized hydrogen atoms and alpha-particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths r_(H):r_(alpha) will be :

Answer»

`1:4`
`2:1`
`1:2`
`4:1`

Solution :Here `q_(H)=eandq_(alpha)=2e`
For CIRCULAR motion,
`(mv^(2))/R=Bqv`
`thereforer=(mv)/(BQ)" "(because"m,V,B are constant")`
`thereforerprop1/q`
`thereforer_(H)/r_(alpha)=q_(alpha)/q_(H)=(2e)/e=2/1`


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