DP Physics (last assessment 2024)
Question 21M.2.HL.TZ2.a.iii
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.2.HL.TZ2.a.iii |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Outline | Question number | a.iii | Adapted from | N/A |
a.iii.
[Maximum mark: 1]
21M.2.HL.TZ2.a.iii
In an experiment to demonstrate the photoelectric effect, monochromatic electromagnetic radiation from source A is incident on the surfaces of metal P and metal Q. Observations of the emission of electrons from P and Q are made.
The experiment is then repeated with two other sources of electromagnetic radiation: B and C. The table gives the results for the experiment and the wavelengths of the radiation sources.
Outline why radiation B gives different results.
[1]
Markscheme
Identifies P work function lower than Q work function ✓
