DP Physics (last assessment 2024)
Question 21M.2.HL.TZ1.10a
| Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.HL.TZ1.10a |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Describe | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
21M.2.HL.TZ1.10a
In an electric circuit used to investigate the photoelectric effect, the voltage is varied until the reading in the ammeter is zero. The stopping voltage that produces this reading is 1.40 V.
(a)
Describe the photoelectric effect.
[2]
Markscheme
electrons are ejected from the surface of a metal ✓
after gaining energy from photons/electromagnetic radiation ✓
there is a minimum «threshold» energy/frequency
OR
maximum «threshold» wavelength ✓
