electromagnetic spectrum

electromagnetic spectrum

1. all travel at the same speed through a vacum 3x10(8)

2. radio waves -- microwaves -- Infrared -- visible light -- ultraviolet -- X Rays -- Gamma rays

   • Increasing Frequency --->>> <<<--- Increasing wave lenth

3. Radio Waves uses: radio waves can be used to communicate infomation , radio waves have the lowest freqencies and shorter wave lenths

4. micro waves: uses: used for heating food by directly transfering energy to water content in the food, also for satilite comuncation

   • Dangers: can directly heat body tissue therefore damage is done before pain is felt

5. infrared: uses: used in heating devices and in thermal cameras which pick up heat traces

   • dangers: readily absorbed by our skin so can cause burns

6. visible light: uses: used by humans to see objects

7. Ultraviolet: uses: used in foresent lamps, disco 'black' lights and sterilising water. some insects can see ultraviolet part of the spectrum and use this to navigate

   • dangers: is responisble for skin cancers and can damage eyes. the sun is the main source of ultraviolet

8. X Rays: used to examine the internal structures of the body in medical use. also used in radio astronomy

   • dangers: can produce cell mutation and cancer women are advised not to have a X rays during pregnacy

9. Gamma Rays: uses: are used to treat certan types of cancer. they are also used for sterilising medical equipment and food products

   • Dangers: can cause cell mutations and cancer in the nuclear industry you have to where special clothing or a monitor to show how much radiation you are exposed to

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11. Red -- Orange -- Yellow -- Green -- Blue -- Indigo -- Violet

    • Increasing Frequency ----> <--- increasing wavelenth