Suppose You Look at a Spectrum of Visible Light by Looking

question 62

Multiple Choice

Suppose you look at a spectrum of visible light by looking through a prism or diffraction grating.How can you decide whether it is an emission line spectrum or an absorption line spectrum?

• A)An emission line spectrum consists of bright lines on a dark background,while an absorption line spectrum consists of dark lines on a rainbow background.
• B)An emission line spectrum consists of a long bright line,while an absorption line spectrum consists of a long dark line.
• C)The only way to decide is to make a graph of the intensity of the light at every wavelength,and then analyze the graph carefully.
• D)The emission line spectrum is produced by electrons jumping up in energy level,while the absorption line spectrum is produced by electrons jumping down in energy level.

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