The document discusses digital and analogue signals, interference, and the electromagnetic spectrum. It explains that digital signals can only have two values of on or off while analogue signals show a continuous range of frequencies. It then lists the different parts of the EM spectrum from gamma rays to radio waves, describing their typical frequencies, wavelengths, and common uses such as sterilization, x-rays, visible light, cooking, and communication.

1. Starter Write down 3 things you can remember about the EM spectrum

3. Digital & Analogue Signals

6. Digital signals are like a normal light switch (on or off) Analogue signals are like dimmer switches (they can take any value)

7. Interference

8. We sometimes call this noise

9. Quick Quiz

10. 1. Am I Digital or Analogue?

11. 2. Am I Digital or Analogue?

12. 3. Am I Digital or Analogue? 1, 1,0,0,1,1,1,1,1,1,1,0,1,0,

13. 4. Am I Digital or Analogue?

14. 5. Am I Digital or Analogue?

15. 6. Am I Digital or Analogue?

16. 7. Am I Digital or Analogue?

17. 8. Am I Digital or Analogue?

18. The EM spectrum (Uses)