# Problems: Cathode-ray oscilloscopes

Fill in the missing words:

1. When a wire is heated in a vacuum, it emits . . . . . . . . . . . . . . . . . .
This process is called . . . . . . . . . . . . . . . . .
2. A current flows in a diode valve only when
3. the cathode is . . . . . . . . . . . . . . . . . and
4. the anode is . . . . . . . . . . . . . . . . . . to attract the  . . . . . . . . . . . . . . . . .  electrons.
5. A beam of electrons (‘. . . . . . . . . . . . . . . . . rays’) can be deflected by a . . . . . . . . . . . . . . . . . or. . . . . . . . . . . . . . . . . . The . . . . . . . . . . . . . . . . .  electrons are deflected away from a . . . . . . . . . . . . . . . . .  –charged plate.
6. In a cathode-ray oscilloscope (CRO) the vertical deflection of the spot is proportional to the . . . . . . . . . . . . . . . . . . applied across the Y-plates.
When studying waveforms, the spot is moved horizontally by a . . . . . . . . . . . . . . . . . circuit.
7. When fast electrons are stopped, . . . . . . . . . . . . . . . . . of very . . . . . . . . . . . . . . . . . wavelength may be produced.