The frequency of yellow light is about 6 × 1014 Hz, while the
frequency that we get even with modern electronic circuits is hardly about
1011 Hz This is why the experimental demonstration of electromagnetic
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wave had to come in the low frequency region (the radio
wave region), as in the Hertz’s experiment (1887) Hertz’s successful experimental test of Maxwell’s
theory created a sensation and sparked off other
important works in this field Two important
achievements in this connection deserve mention