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The spectrum that she will be observing is called an emission spectrum, in which electrons are excited to a higher energy state and then drop back down to the ground state, during which the electrons will emit photons of specific wavelengths, which will be observed as bright lines of color on what appears to be a black background.

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Q: In which case will the woman see a just a spectrum that is almost entirely black except for few bright emission lines?
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What spectrum is produced by a hot gas under low pressure and appears in a series of bright lines?

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