Nota Terkini

Thursday, October 06, 2011

[Physics Form 5] Cathode Rays


Question:
How are cathode rays formed?

Answer:
  • The 6V source first heats up the filament, which, in turn, heats up the cathode.

  • The cathode thus exhibits thermionic emission and produces thermal electrons.

  • The EHT exerts a strong electric field between the cathode and the anode, causing the thermal electrons to accelerate, and travel at a high speed and in a straight line towards the anode.

  • The beam of fast-moving electrons generated is known as cathode rays.

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