The diagram below represents the bright-line spectra of four elements and a bright-line spectrum produced by a mixture of three of these elements.
Can someone help me with this one? I dont understand that at all :(
![The diagram below represents the brightline spectra of four elements and a brightline spectrum produced by a mixture of three of these elementsCan someone help class=](https://us-static.z-dn.net/files/d2e/02528da48e1cae8326f395d56d7a2657.png)