Question

An emission spectrum for an unknown element has one blue line and one green line against a black background.​

Answer 1

Answer:

There are two types of spectral lines in the visible part of the electromagnetic spectrum: Emission lines – these appear as discrete coloured lines, often on a black background, and correspond to specific wavelengths of light emitted by an object.

Answer 2

Colored lines in the spectrum are known as emission lines.

Explanation:

• The Emission spectrum show coloured lines
• These spectral lines occur when electrons of an excited atom move from its ground state to excited state and then return to the ground state.
• These lines help in identifying the elements or molecules which are causing these spectral lines.
• There are two types of spectral lines which are visible through spectrophotometer
• They appear as discrete coloured lines with a black background.