An electron gun in a cathode-ray tube contains a heated cathode and an anode. Which row in the table correctly identifies the process by which electrons are released from the cathode, and the charge on the accelerating anode?
| Process of electron release | Charge on the anode | |
|---|---|---|
| A | photoelectric emission | negative |
| B | photoelectric emission | positive |
| C | thermionic emission | negative |
| D | thermionic emission | positive |
Process: photoelectric emission; Charge: negative
Process: photoelectric emission; Charge: positive
Process: thermionic emission; Charge: negative
Process: thermionic emission; Charge: 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.