DP Physics (last assessment 2024)
Question 21M.2.HL.TZ2.a.ii
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.2.HL.TZ2.a.ii |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Outline | Question number | a.ii | Adapted from | N/A |
a.ii.
[Maximum mark: 1]
21M.2.HL.TZ2.a.ii
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 electrons are never emitted for radiation C.
[1]
Markscheme
photon energy is less than both work functions
OR
photon energy is insufficient «to remove an electron» ✓
Answer must be in terms of photon energy.
