P1

P1

1. Visible has the greatest wave length.

2. Infrared is reflected by shiny surfaces and heats food.

3. Digital = on/off

4. Analogue = continuously varies

5. noise = any random signal

   • it's hard to remove noise from an analogue signal because both signals continuously vary. Noise is easier to remove from a digital signal because it is a different type of signal from the noise.

6. Similarities: diffraction after barrier, change in wave, change in wave direction, wave curves/bends after barrier, wave speed/wavelength stays same

   • Differences: B has less diffraction, A has more diffraction

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