1. What are lasers used for?
- Carrying data through optic fibres
- remote contols
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Other questions in this quiz
2. What happens to a wave when it passes a doorway?
- It doesnt change
- It defracts
- It stops
3. Why is it better?
- The signal is less likely to be lost or inturrupted
- it travels faster
4. What is one kind of seismic wave?
- S waves / P waves
5. Which is better? Dialogue or analogue?