スペクトル線せん

noun

spectral line

Technical term in physics for a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range.

• スペクトル線せんの観かん測そくから、星ほしの化か学がく組そ成せいがわかる。

  From the observation of spectral lines, we can determine the chemical composition of a star.