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.

 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.

c (diamond),

sio2 (quartz)

where are the choice options?