Q: In the electromagnetic spectrum, which type of wavelength has shortest wavelength. Its main uses are in medical diagnosis.
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A: gamma waves

Q: From the Greek meaning 'against', and 'a name', what is a word called which has the opposite meaning to another word?
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A: antonym

Q: What number isotope of carbon is used in radiocarbon dating, a method invented by Willard Libby in the 1940s?
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A:
14