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physics (waves (Electro-magnetic (Optics (Visible (Green, Red, Blue),…

- - - - https://www.youtube.com/watch?v=_Okhe0tmGZY
        
        :
        
        https://youtu.be/WOdCNF5I9YU
        
        https://youtu.be/FpX1A7HEFEo
        
        https://youtu.be/CR_XL192wXw
      - Speed of soundWave https://youtu.be/UgE2GIQwUCw
  - - - uv
        
        UVhttps://youtu.be/GRD-xvlhGMc
        
        UV degradation on hunan skin https://youtu.be/Cf7Ar3nEUmw
        
        https://youtu.be/K6MLd3MHrt4?t=115
        
        https://youtu.be/QALt_ja2HGY
        
        https://youtu.be/8fh4LfUc-AI
      - General
        
        https://www.youtube.com/watch?v=_A7eRgnaSsE
        
        https://www.youtube.com/watch?v=_JOchLyNO_w
      - Visible
        
        Green
        
        Red
        
        Blue
      - Infra RED