A team uses three systems to monitor a volcano.
Word bank: infrared, microwaves, visible light
| System | Task | Region of the electromagnetic spectrum |
|---|---|---|
| A | Producing thermal images of the lava | |
| B | Taking ordinary colour photographs | |
| C | Sending measurements to a satellite |
Complete the final column of the table. Use each answer from the word bank once.
Give the order of systems A, B and C from lowest frequency to highest frequency.
Two sources of electromagnetic radiation are used to test sensors.
| Source | Region of the electromagnetic spectrum | Frequency in Hz |
|---|---|---|
| P | ultraviolet | 1.0 × 1015 |
| Q | X-rays | 3.0 × 1017 |
Both sources have the same intensity and exposure time, and the radiation is absorbed by the same type of tissue.
Use the frequency data to give the source with the greater potential danger.
104 exam-style questions on Edexcel GCSE Physics 5.4 Uses and dangers of EM radiation, covering 5.4.1 Dangers of electromagnetic radiation, 5.4.2 Uses of electromagnetic radiation, 5.4.3 Radio waves and oscillations in circuits, and 5.4.4 Changes in atoms and nuclei generating radiation. Each one has a worked solution and a mark scheme showing where the marks go.