Colour portrait of the German experimental physicist Wilhelm Konrad Roentgen,1845-1923,discoverer of X-rays. While using a discharge tube (in which an electric discharge is passed through a gas at low pressure) in a darkened room,he noticed that a card coated with barium platinocyanide glowed when the tube was switched on. The effect was not blocked by an intervening wall,or even a thin sheet of metal. Roentgen termed this newly discovered phenomenon X-ray radiation,& suggested that it consisted of electromagnetic rays with a shorter wavelength than light. He was awarded the first Nobel Prize for physics,in 1901 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
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