Question SPM.2.HL.TZ0.3
| Date | May Specimen-2023 | Marks available | [Maximum mark: 5] | Reference code | SPM.2.HL.TZ0.3 |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Determine, Outline | Question number | 3 | Adapted from | N/A |
In a microwave oven electromagnetic waves are emitted so that a standing wave pattern is established inside the oven.
A flat piece of chocolate is placed inside the oven and the microwaves are switched on. The chocolate is stationary.
Melted spots form on the surface of the chocolate. The diagram shows the pattern of melting on the chocolate. Each square has a length of 1 cm.
Outline how this standing wave pattern of melted spots is formed.
[2]
standing waves form «in the oven» by superposition / constructive interference ✓
energy transfer is greatest at the antinodes «of the standing wave pattern» ✓
Determine, taking appropriate measurements from the diagram, the frequency of the electromagnetic waves in the oven.
[3]
«cm» ✓
«» ✓
GHz ✓ correct answer only including power of ten
Allow ±2 mm.
Condone power of ten error in MP2 only.