| Date | November 2020 | Marks available | 1 | Reference code | 20N.1.HL.TZ0.23 |
| Level | Higher level | Paper | Paper 1 | Time zone | 0 - no time zone |
| Command term | Question number | 23 | Adapted from | N/A |
Question
Three historical developments in physics were
I. wave–particle duality
II. the kinetic model
III. the equivalence of mass and energy.
Which of these represented a paradigm shift in scientific thinking?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Markscheme
B
Examiners report
[N/A]
