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James Clerk Maxwell

Born: 13 June 1831

Died: 5 November 1879

Scottish mathematical physicist.

Developed equations for

the electromagnetic field which suggested that waves in the field would travel with a speed that was very close to the known speed of light. Maxwell therefore suggested that visible light consisted of radiation in the electromagnetic field

Heinrich Rudolf Hertz

  • His most notable achievement was to formulate the theory of electromagnetic radiation, bringing together for the first time electricity, magnetism, and light. Maxwell's equations for electromagnetism have been called the "second great unification in physics" after the first one by Isaac Newton.

Born: 22 February 1857

Died:1 January 1894

German physicist

With the publication of A Dynamical Theory of the Electromagnetic Field in 1865, Maxwell demonstrated that electric and magnetic fields travel through space as waves moving at the speed of light.

The SI unit hertz (Hz) was established in his honor by the IEC in 1930 for frequency, an expression of the number of times that a repeated event occurs per second in 1960. Officially replacing the previous name, "cycles per second" (cps) which was formulated by James Maxwell

Proved the existence of electromagnetic waves theorized by James Clerk Maxwell's electromagnetic theory of light

Engineered instruments to transmit and receive radio pulses using experimental procedures that ruled out all other known wireless phenomena

Hertz's first radio transmitter: a dipole resonator consisting of a pair of one meter copper wires ending in 30 cm zinc spheres. When an induction coil applied a high voltage between the two sides, sparks across the center spark gap

created standing waves of radio frequency current in the wires, which radiated radio waves. The frequency of the waves was roughly 100 MHz, about that used in modern television transmitters.

Sound

James Maxwell

Heinrich Hertz

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