Which of the following cannot be determined from the spectrum of a star?

the chemicals in the atmosphere of the star

the motion of the star

the temperature of the atmosphere of the star

the chemicals in the core of the star

I think the correct answer from the choices listed above would be the last option. It is the chemicals in the core of the star that cannot be determined from the spectrum of a star. Spectrum shows the different classification of the stars depending on their spectral characteristics. It usually involves the light, the wavelength and the distance.

Motion of the star

Because the spectrum is measured by the ray of light coming from star and it changes its distance continuously ... so it cant be determined