Radio wave

 Radio wave  is an electromagnetic wave of a frequency between about  10⁴ and 10¹¹ or 10¹² Hz , as used for long distance communication.They have the longest  wavelengths in the electromagnetic spectrum. Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies as high as 300 gigahertz to as low as 30 hertz. At 300 GHz, the corresponding wavelength is 1 mm; at 30 Hz the corresponding wavelength is 10,000 km.

Uses/Functions of radio wave

i)They are used in radio and television communication systems.

ii)For navigation of ships and aircraft the radio range,compass and time signals are widely used.

iii)By measuring the time required for the waves to bounce off the object and return to a receiving antenna,the location of the object can be found.

Some pictures of radio wave

    

                                                     

Facts of Radio waves

i)Wireless radio was discovered by German inventor,Heinrich Hertz,in 1800s.

ii)An Italian inventor,Guglielmo Marconi,is known as the"Father of Radio" because he made         practical and useable radio sets based on the Hertz discovery.

iii)Radio waves travel at the speed of  light 186,282 miles per second.

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