WHEN YOU log on to Google today you will find that a thin line in Google's colours - green, blue, red and yellow - moving in the a form of an electromagnetic wave. On clicking the doodle, you will be directed to the Wikipedia page of physicist Heinrich Rudolf Hertz. Google have created this doodle to pay tribute to Hertz on the occasion of the 155th birthday of the physicist who was the first one to broadcast and receive radio waves. He worked extensively for the development of radio, television and radar, so much so that the unit of frequency of radio wave - Hertz - is named after him.

Born on February 22, 1857, Hertz first proved the existence of radio waves in 1880’s using a simple two rods experiment. He took up two rods that created a receiver and a spark gap as the receiving antennae. He saw that whenever the rods were picked up, sparks would jump and he proved with this experiment that the sparks that passed possessed all the properties of an electromagnetic wave. 

With this establishment Hertz proved two more things. Firstly he practically proved what  James Clerk  has theorised with his Maxwell's waves-  the velocity of radio waves was equal to the velocity of light. (This proved that radio waves were a form of light). Secondly he also found out the method to make an electric and magnetic fields detach themselves from wires and go free as Maxwell's waves. He died at a young age of 36 but gave to the world an important scientific gift. Google is known to honour people with their Doodle and they have graduated from simple doodles to Doodle’s moving about, changing shape and colour. This time at the 155 birthday of Heinrich Rudolf Hertz, they have made a simple wave move continuously. Simple and clever this doodle is the site’s 1308 doodles on its home page since the first ever Google doodle.