Correct option is C
The correct answer is (c) Electromagnetic telegraph.
· Carl Friedrich Gauss and Wilhelm Eduard Weber invented the electromagnetic telegraph in 1833. This device used electrical signals to transmit messages over a wire, which was a significant advancement in communication technology at the time. It laid the groundwork for the development of modern telecommunications.
Information Booster:
· Particle Accelerator: A device used to accelerate atomic and subatomic particles to high speeds, invented much later in the 20th century.
· Transistor: A semiconductor device used to amplify or switch electronic signals, invented by John Bardeen, Walter Brattain, and William Shockley in 1947.
· Optical Maser (Laser): An acronym for Light Amplification by Stimulated Emission of Radiation, the laser was invented by Theodore Maiman in 1960.
Gauss and Weber's invention of the electromagnetic telegraph marked a pivotal moment in the history of communication, enabling faster and more reliable transmission of information over long distances.