What does X stand for in the term X-ray?
Question and options
What does X stand for in the term X-ray?
- Exact
- Unknown
- Electric
- Ultraviolet
Answer and explanation
Correct answer: B - Unknown
Wilhelm Röntgen, who discovered the rays in 1895, called them “X” rays because their nature was unknown, X being the usual symbol for an unknown quantity. The letter has nothing to do with electricity, exactness or ultraviolet light, which is a different kind of radiation.
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