1_electromagnetic waves

1_electromagnetic waves

1. Infrared Radiation

   • discovered by Herschel
   • it was discovered in the 1800
   • when white light goes through a prism is creates a spectrum of colours
     • the temperature increased from violet to red
     • he used a thermometer to measure the temperature of each color and also measured the temperature beyond the color of red and realised that there was an invisible light.

2. Waves

   • there are 7 types of electromagnetic (EM) waves
     • All EM waves are transverse waves
       • They all travel at same speed in a vacuum
     • high frequency waves have shorter wavelengths

3. Ultra violet radiation

   • discovered by Ritter
   • it was discovered in 1801

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