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2. Why is it better?

  • The signal is less likely to be lost or inturrupted
  • it travels faster

3. What are lasers used for?

  • Carrying data through optic fibres
  • remote contols

4. What is the trough on a wave?

  • the lowest point on a wave
  • the highest point on a wave

5. What is one kind of seismic wave?

  • S waves
  • earthquake
  • P waves
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