In terms of the modern quantum theory electromagnetic radiation is the flow of photons also called light quanta through space photons are packets of energy h that always move with the universal speed of lightthe symbol h is plancks constant while the value of is the same as that of the frequency of the electromagnetic wave of classical theory. Electromagnetic radiation electromagnetic radiation microwaves the microwave region extends from 1000 to 300000 mhz or 30 cm to 1 mm wavelength although microwaves were first produced and studied in 1886 by hertz their practical application had to await the invention of suitable generators such as the klystron and magnetron microwaves are the principal carriers of high speed data . According to classical physics a moving charged particle emits electromagnetic waves in a quantum mechanical picture when a charged particle moves inside a polarizable medium with molecules it excites the molecules to the higher levels and excited states upon returning back to their ground state the molecules re emit some photons in the form of electromagnetic radiation according to the
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