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Heinrich Rudolf Hertz, (1857 - 1894) German physicist who was the first to broadcast and receive radio waves. He produced, electro-magnetic waves, sent them through space, and measured their wave-length and speed. He, showed that the nature of their vibration, reflection and refraction was the same as that of light and, heat waves, establishing their identity for the first time. He also pioneered research on discharge of, electricity through gases, and discovered the photoelectric effect.