Anode Rays | Grade IX

Anode rays are also known as canal rays.

Origin of Anode Rays

  • In a discharge tube, cathode rays are emitted from the cathode. These rays consist of stream of electrons which move towards anode with very high speed. When these electrons strike the atoms or molecules of thegas in the discharge tube, one or more electrons are knocked off from the atoms or molecules of the gas and results in the formation of positively charged ions. These positive charged ions (particles) of the gas constitute the anode rays. Properties of Anode Rays
  • Anode rays travel in straight lines.
  • Anode rays consist of material particles.
  • Anode rays are deflected by electric field towards negatively charged plate. This indicated that they are positively charged.
  • When a magnetic field is applied in a direction perpendicular to the path of anode rays, they get deflected in the direction expected for positive particles. This further indicates that they are positively charged.
  • Charge to mass ratio of the particles in the anode rays depends upon nature of the gas taken in the discharge tube.

    Charge and Mass of Particles Consisting Anode Ray

  • A proton is a positively charged particle present in the atoms of all elements.
  • The mass of a proton is 1838 times that of an electron. The relative mass of a proton is equal to 1.005757 amu which is taken to be equal to 1 amu. The absolute mass of a proton is 1.672 x 10-24 g.
  • The charge on a proton is equal in magnitude but opposite in sign to that of an electron. The charge carried by a proton is equal to 1.602 x 10-1g C which is taken to be one unit of positive charge (i.e., +1). Thus, a proton is said to carry a unit positive charge.
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