6. What does monochromatic mean?
- 1 colour
- 1 wavelength
- 1 speed
7. Why is it better?
- The signal is less likely to be lost or inturrupted
- it travels faster
8. Which is better? Dialogue or analogue?
- Dialogue
- Analogue
9. What happens to a wave when it passes a doorway?
- It defracts
- It stops
- It doesnt change
