Year 9 Science · Unit 4 · Lesson 8
Foundation Worksheet
Learning Goals
Order the steps
Number the seven types of electromagnetic radiation from 1 (lowest frequency / longest wavelength) to 7 (highest frequency / shortest wavelength). Then write the wavelength direction in the box provided.
| Order (1–7) | EM wave type | Wavelength direction arrow |
|---|---|---|
| Gamma rays |
Wavelength: Longest → Shortest Write which end: | |
| Infrared | ||
| Radio waves | ||
| Ultraviolet | ||
| Microwaves | ||
| X-rays | ||
| Visible light |
The mnemonic Raging Martians Invaded Venus Using X-ray Guns helps remember the order (R→M→I→V→U→X→G). Write what each letter stands for:
| Letter | EM wave type | Letter | EM wave type |
|---|---|---|---|
| R | V | ||
| M | U | ||
| I | X | ||
| G | |||
Match each term to its primary application
Draw a line connecting each EM wave type on the left to its primary application on the right. Or write the matching letter next to each term.
| EM wave type | Your answer | Primary application |
|---|---|---|
| Radio waves | A. Medical imaging of bones and internal structures | |
| Microwaves | B. Cancer treatment (radiotherapy) and sterilising food | |
| Infrared | C. AM/FM broadcasting and Wi-Fi communications | |
| Visible light | D. Sterilisation of equipment and UV forgery detection | |
| Ultraviolet | E. Heating food and mobile phone networks | |
| X-rays | F. TV remote controls and thermal imaging cameras | |
| Gamma rays | G. Photography and human vision |
1. State two properties that all electromagnetic waves share, regardless of their frequency.
2. Explain why visible light is described as only a “tiny slice” of the electromagnetic spectrum. What is special about the visible light range compared to the full spectrum?
Wrap Up
In one sentence, what was the main idea of this lesson?