3.3 Electromagnetic spectrum

3.3 Electromagnetic spectrum

1. describe the main features of the electromagnetic spectrum in order of wavelength

2. state that the speed of electromagnetic waves in a vacuum is 3.0 x 10 to the power of 8 m/s and is approximately the same in air

3. state that all electromagnetic waves travel at the same high speed in a vacuum

4. describe typical properties and uses of radiations in all the different regions of the electromagnetic spectrum including:

   • radio and television communications
     • radio waves
   • satellite television and telephones
     • microwaves
   • electrical appliances, remote controllers for television and intruder alarms
     • infrared
   • medicine and security
     • X- rays

5. demonstrate an awareness of safety issues regarding the use of microwaves and X-rays