Deflection of Radiation in Electric Field

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Deflection of Radiation in Electric Field
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Radiation from a source is directed into a
uniform electric field by passing through a
narrow slit formed by two lead plates. This
ensures the radiation travels in a single
direction before entering the electric field.
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The propagation of gamma radiation is NOT
affected by the external electric field.
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• The magnitude of the electric force on an alpha
  particle is twice that on an beta particle
  because the magnitude of electric charge on an
  alpha particle is twice that on a beta particle.
• The mass of alpha particle is about 7360 times
  that of beta particle.
• Thus the acceleration (force / mass) experienced
  by the alpha particle is much smaller than that
  experienced by the beta particle. Hence the
  deflection of the alpha particle is small
  compared to that of the beta particle.

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Deflection of Radiation in Magnetic Field
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A uniform magnetic field is set up between two
magnetic poles of slab magnets. Radiation from a
source is directed into the uniform magnetic
field by passing through a narrow slit formed by
two lead plates. This ensures the radiation
travels in a single direction before entering the
magnetic field.
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I is the equivalent current direction. Current is
defined as a flow of positive charge.

• For alpha particle, the direction of I is the
  same as the direction of motion of the particle.
• For beta particle, the direction of I is
  opposite to the direction of motion of the
  particle.

F is the force acting on the particle as it moves
in the magnetic field. The direction of F can
be determined by Flemings Left Hand Rule.
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The propagation of gamma radiation is NOT
affected by the external magnetic field.
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The deflection of beta particle much greater than
that of alpha particle because beta particle has
much smaller mass.