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Question

The schematic diagram is given for cathode ray discharge tube experiment.

Which of the following statement(s) is/are true about the above experiment?

A

Cathode rays starts from anode and move towards cathode

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B

Cathode rays start from cathode and move towards anode

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C

Cathode rays consist of negatively charged particles

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D
Cathode rays are invisible to the naked eye but produces a bright spot when it strikes on the surface of the fluroscent
material
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Solution

The correct option is D Cathode rays are invisible to the naked eye but produces a bright spot when it strikes on the surface of the fluroscent
material
  • From the diagram, we can observe that cathode rays originate from the electrode which is connected to the negative terminal of battery (cathode) and move towards the electrode which is connected to positive teminal of the battery (anode).
  • Since cathode ray particles are attracted towards anode, we can say that it has negatively charged particles.
  • Cathode rays are invisible to the naked eye but a bright spot is observed when it strikes the fluroscent material passing through holes of anode.

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