Electromagnetic spectrum

Uses of EM waves

• Radio- radio and TV

• Microwaves- satellite communication, cooking food

• Infrared- electric heaters, cooking food, infrared cameras

• Visible- fibre optic communication

• Ultra violet- energy efficient lamps, sun tanning

• X-rays- imaging bones

• Gamma rays- radiotherapy, medical imaging

What are these properties of EM waves on materials?

1. Transmit

2. Specular reflection

3. Diffuse reflection

4. Absorb

5. Refract

Label the wavelengths

1. Radio- produced by oscillations in circuits

2. Microwaves

3. Infrared- thermal energy

4. Visible

5. Ultra violet- skin damage

6. X rays- cause cancer

7. Gamma rays- cause cancer

Concave and convex