Electromagnetic spectrum definition physics

It is the arrangement of electromagnetic radiations on the basis of their wavelengths or frequencies.

or

E= energy

= wavelength

= frequency

As energy is inversely related to wavelength and directly related to frequency, thus radiations with high wavelengths have low energy and low frequency and vice versa.

In order from highest to lowest frequency , the radiations of the  spectrum are gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, microwaves and  radio waves.

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