In a cathode-ray tube, a beam of electrons is produced and accelerated to form a cathode ray.
Which row correctly identifies the process by which electrons are released from the cathode, and the charge on the anode required to accelerate them?
| Process of electron emission | Charge on the anode | |
|---|---|---|
| A | Photoelectric effect | negative |
| B | Photoelectric effect | positive |
| C | Thermionic emission | negative |
| D | Thermionic emission | positive |
Photoelectric effect, negative
Photoelectric effect, positive
Thermionic emission, negative
Thermionic emission, positive
67 exam-style questions on CIE IGCSE Physics 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.