History and Discoveries in Electromagnetic spectrum

    The first part of electromagnetic spectrum to be discovered is infrared radiation, by William Herschel in 1800.

Fig. Discoveries of EM waves yearwise


   Later Next year, Johann Ritter, noticed chemical rays behaving similarly to visible violet rays which are named as ultraviolet rays.
Michael Faraday in 1845 first linked electromagnetic radiation with electromagnetism. He noticed that the polarized light travelling through a transparent material responds to a magnetic field, which is called as Faraday effect. 




      In 1860, James Maxwell developed 4 partial differential equations for electromagnetic field, by these he realized that waves must travel at speed that was about the speed of light.
Wilhelm Rontgen in 1895 noticed a new type of radiation which is emitted during an experiment with an evacuated tube which subjected  to a high voltage. He called these radiation as X-Rays.

     In 1900, Paul Villard identified new type of radiation while studying radioactive emmissions of radium. He first thought it consist of particles similar to alpha and beta particles. But they have more penetrating power than both of them.
In 1914 , Ernest Rutherford named it as Gamma Rays. 


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