Cathode rays (AQA A-Level Physics): Flashcards
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What is a cathode ray?
What is a cathode ray?
Stream of particles observed when potential difference is applied across a low-pressure gas tube
Scientist who discovered the electron via cathode rays
Scientist who discovered the electron via cathode rays
J.J. Thomson
What charge do cathode rays carry?
What charge do cathode rays carry?
Negative charge
How does gas type affect cathode ray properties?
How does gas type affect cathode ray properties?
Properties remain uniform regardless of gas used
Charge-to-mass ratio: cathode rays vs atoms
Charge-to-mass ratio: cathode rays vs atoms
Much higher than atoms
Modern name for cathode ray particles
Modern name for cathode ray particles
Electrons
Where is the glow most intense in a discharge tube?
Where is the glow most intense in a discharge tube?
At the cathode
What causes gas ionisation in a discharge tube?
What causes gas ionisation in a discharge tube?
High potential difference strips electrons from gas atoms
How do excited atoms produce visible glow?
How do excited atoms produce visible glow?
Emit photons when returning to original energy states
Why is the glow brightest at the cathode?
Why is the glow brightest at the cathode?
Ion-electron recombination releases many photons there