WAEC Physics 2016 Theory — Question 7

Model answer

From the diagram of the cathode ray tube: X = Heat supply/filament — Heat supply to the cathode to release electrons (thermionic emission) Y = Anode — Accelerates electrons to high velocity Z = Deflecting plates — Y-plate deflects the electron beam vertically; X-plate deflects the electron beam horizontally Other components and functions: 1. Heat supply (filament): Heat the cathode to release the electrons 2. Cathode: Produce electrons on heating 3. Grid: Control the amount of electrons reaching the screen 4. Anode: Accelerates electrons to high velocity 5. Y-plate: Deflect electron beam vertically 6. X-plate: Deflect electron beam horizontally 7. Fluorescent screen: Glows when struck by electrons to produce bright spot on screen