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A spectroscope is used to examine white light that has been passed through a sample of mercury vapour. Dark lines, characteristic of the absorption spectrum
A spectroscope is used to examine white light that has been passed through a sample of mercury vapour. Dark lines, characteristic of the absorption spectrum of mercury, are observed. (a) Explain what eventually happens to the energy the mercury vapour absorbs from the white light. (b) Explain why the absorption lines are dark.
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