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What causes the appearance of lines in an emission spectrum?

Light is absorbed as an electron moves to a higher energy state.
Light is released as an electron moves to a lower energy state.
An electron is released as light when it moves to a lower energy state.
An electron is released as light when it moves to a higher energy state.

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 Emission spectrum is the spectrum of frequencies of electromagnetic radiation which are emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

So, the appearance of lines in an emission spectrum is caused by :

Light is released as an electron moves to a lower energy state.

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