Where and by What Technique Was the Element Helium First

question 123

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 aurorae, or northern lights

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Definitions:

Write Function

A standard library function in many programming languages used to write data to a file or an output stream.

Pointers

Variables used to store the addresses of other variables or memory locations, enabling direct memory manipulation and array management.

Variables

Entities in programming that store data which can change during program execution.