The diagram in figure shows a radioactive source S placed in a thick lead walled container. The radiations given out are allowed to pass through a magnetic field. The magnetic field (shown as x) acts perpendicular to the plane of paper inwards. Arrows shows the paths of the radiation A, B and C. Explain clearly how you arrive at naming the radiations labelled A, B and C.
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The radiation labelled as A is gamma radiation as they have no charge and thus under the action of magnetic field they go undeflected. The radiation labelled as B is alpha radiation since its mass is large and it would be deflected less in comparison to beta radiation. Fleming’s left hand rule determines the direction of deflection. As the alpha and beta have opposite charges, hence the direction of deflection of alpha and beta radiations are also opposite and thus the radiation labelled C is β radiation.