- The cooler, denser surface material scatters certain wavelengths of light, forming dark lines.
- The atoms at the surface absorb certain wavelengths of light, causing the dark lines at those wavelengths.
- The atoms in the Sun’s interior emit light of specific wavelength, so that parts of the spectrum are dark.
- The atoms at the surface are excited by the high interior temperatures, so that the dark lines are merely wavelengths at which those atoms don’t emit energy.
This is College Physics Answers with Shaun Dychko. Dark lines in the spectrum of light from the Sun is a result of certain wavelengths being absorbed by the cool gas on the exterior of the Sun. And so the answer is (b); the atoms at the surface of the Sun absorb certain wavelengths and those wavelengths are therefore not transmitted and that causes black lines there.