A beam of monochromatic light of frequency f f\,f is incident on a clean metal surface, causing the emission of photoelectrons. The frequency of the light is doubled while the total energy incident on the surface per second (the power) is kept constant. Which row in the table correctly describes the changes to the maximum kinetic energy of the photoelectrons and the number of photoelectrons emitted per second?
| Maximum kinetic energy of the emitted photoelectrons | Number of photoelectrons emitted per second | |
|---|---|---|
| A | Increases | Increases |
| B | Increases | Decreases |
| C | Decreases | Increases |
| D | Decreases | Unchanged |
Row A
Row B
Row C
Row D
31 exam-style questions on AQA A Level Physics Electromagnetic radiation and quantum phenomena, covering The photoelectric effect, Collisions of electrons with atoms, Energy levels and photon emission, and Wave-particle duality. Each one has a worked solution and a mark scheme showing where the marks go.