3.3 Electromagnetic spectrum
3.3.2—All EM waves travel at the same high
3.3.3—EM spectrum uses: (a) radio waves
3.3.4—Harm from excessive EM radiation: (a)
3.3.5—Communication with artificial
3.3.6—Speed of EM waves in a vacuum is 3.0 ×
3.3.7—EM radiation: (a) mobile
3.3.8—Difference between a digital and
3.3.9—A sound can be transmitted as a
3.3.10—Benefits of digital signalling
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