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B
H. Kissinger
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C
Sir C. V. Raman
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D
Meghnad Saha
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Solution
The correct option is A Wilhelm. K. Roentgen Wilhelm Roentgen, a German professor of physics, was the first person to discover electromagnetic radiation in a wavelength range commonly known as X-rays today. Although, many people had observed the effects of X-ray beams before, Roentgen was the first one to study them systematically. To highlight the unknown nature of his discovery, he called them X-rays though they are still known as Roentgen rays as well. For his remarkable achievement he was honoured with the first he first Nobel Prize in Physics in 1901.