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Answer:The appearance of lines in an emission spectrum is caused by the fact that light is released as an electron moves to a lower energy state. When the atoms absorb energy they get excited and reach a higher level of energy. Then, when those atoms that are unstable release energy they pass to a lower level and emit light.
The appearance of lines in an emission spectrum is caused by the gas cloud on its own, without a light source behind it.
What is an emission spectrum?
- The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an electron making a transition from a high energy state to a lower energy state.
- The photon energy of the emitted photon is equal to the energy difference between the two states.
- There are many possible electron transitions for each atom, and each transition has a specific energy difference.
- A gas cloud on its own, without a light source behind it, produces a line emission spectrum.
- When gas is cool, it absorbs the same wavelengths of light as it would emit when it is hot.
Hence, the appearance of lines in an emission spectrum is caused by the gas cloud on its own, without a light source behind it.
To learn more about the emission spectrum, refer to: https://brainly.com/question/2726279
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