Where and by What Technique Was the Element Helium First

question 129

Multiple Choice

Where and by what technique was the element helium first discovered?

• A) in radioactive rocks, by radioactive measurements of uranium deposits
• B) on the Sun, from spectroscopy during a solar eclipse
• C) in the laboratory, by examining the spectrum of heated chemicals in a flame
• D) in the upper atmosphere of Earth, by studying the spectrum of the aurora, or northern lights

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