In the mid-nineteenth century physicists sudying the solar emission spectrum (a

ID: 1392123 • Letter: I

Question

In the mid-nineteenth century physicists sudying the solar emission spectrum (a continum) noticed a set of dark lines that did not match any of the emission lines (bright lines) on Earth. They concluded that the lines came from a yet unknown element. Later this element was identified as helium.

a. What is the origin of th edark lines? How were these lines correlated with the emission lines of helium?

b. Why was helium so difficult to detect in Earth's atmosphere?

c. Where is the most likely place to detect helium on Earth?

Explanation / Answer

a.) Dark lines in the solar spectrum are caused by absorption by chemical elements in the Solar atmosphere. The lines that corresponds for emission lines of helium were missing from solar spectrum.

b.)The low atomic mass of helium causes it to float.Helium is the second lightest element in the known universe.Helium only accounts for 0.00052% of the Earth

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