- 
  
  
        a British astronomer, discovered infra-red radiation (heat waves). - 
  
  
        a British astronomer, discovered infra-red radiation (heat waves). - 
  
  
        German chemist that discovered UV radiation - 
  
  
        german chemist discovered UV radiation - 
  
  
        a British scientist, predicted the existence of continuous EM waves - 
  
  
        a British scientist, predicted the existence of continuous EM waves. - 
  
  
        german scientist that created radio waves - 
  
  
        german scientist that discovered radio waves. - 
  
  
        German physicist discovered x-ray - 
  
  
        german physicist discovered x-rays - 
  
  
        French physicist that discovered radioactive rays emitted by uranium. - 
  
  
        French physicist discovered radioactive rays emitted by uranium. - 
  
  
        discovered radium. - 
  
  
        discovered radium. - 
  
  
        frenchman discovered gamma rays