Question

The diagram in fig. shows a source S placed in a thick lead walled container. The radiation given out is allowed to pass through a magnetic field. The magnetic field (shown as x) acts perpendicular to the plane of paper inwards. Arrows show the paths of the radiations A, B and C. Explain clearly how you used the diagram to find the radiations A, B, and C.

Answer 1

For charged radiation the direction of deflection can
be determined by Fleming’s left hand rule.
i. The Fleming Left hand rule demonstrates that B
must be positively charged as it deflected towards
the left side. So, B represents Alpha (α) positive
charged particles.
ii. Deflection observed in Negatively charged articles will be opposite of alpha particles, So, C presents Beta (β) particles.
iii. Gamma (γ) rays are unaffected (as they are Neutral) by a magnetic field. So, A represents Gamma rays (γ).