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the EM spectrum, radio, microwave, infrared, visible light, x-ray,…

- - - - electrical heaters, cookers for cooking food, infrared cameras
        
        vision
        
        energy-efficient lightbulbs, tanning beds
        
        UV rays have a higher energy than light waves and can carry more information. it uses less energy for the bulb to absorb UV rays and convert it into visible light
        
        medical imaging
        
        can visualise broken bones
        
        medical imaging
        
        detect cancer
      - waves can pass through the atmosphere, unlike radio waves
- - - - frequencies which are absorbed by some chemical bonds
        
        allows us to see
        
        risk of skin cancer or premature skin ageing because the wavelength is penetrative to skin
        
        very penetrative
        
        very penetrative